diff --git a/sync/api/syncable_service.h b/sync/api/syncable_service.h
index 960abc5781fa77..f83a017c2da14f 100644
--- a/sync/api/syncable_service.h
+++ b/sync/api/syncable_service.h
@@ -63,9 +63,8 @@ class SYNC_EXPORT SyncableService
   // Returns: A default SyncError (IsSet() == false) if no errors were
   //          encountered, and a filled SyncError (IsSet() == true)
   //          otherwise.
-  virtual SyncError ProcessSyncChanges(
-      const tracked_objects::Location& from_here,
-      const SyncChangeList& change_list) override = 0;
+  SyncError ProcessSyncChanges(const tracked_objects::Location& from_here,
+                               const SyncChangeList& change_list) override = 0;
 
   // Returns AttachmentStore used by datatype. Attachment store is used by sync
   // when uploading or downloading attachments.
diff --git a/sync/engine/apply_control_data_updates_unittest.cc b/sync/engine/apply_control_data_updates_unittest.cc
index 7248d141815c36..7ed6bd4899f060 100644
--- a/sync/engine/apply_control_data_updates_unittest.cc
+++ b/sync/engine/apply_control_data_updates_unittest.cc
@@ -35,16 +35,14 @@ class ApplyControlDataUpdatesTest : public ::testing::Test {
  public:
  protected:
   ApplyControlDataUpdatesTest() {}
-  virtual ~ApplyControlDataUpdatesTest() {}
+  ~ApplyControlDataUpdatesTest() override {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     dir_maker_.SetUp();
     entry_factory_.reset(new TestEntryFactory(directory()));
   }
 
-  virtual void TearDown() {
-    dir_maker_.TearDown();
-  }
+  void TearDown() override { dir_maker_.TearDown(); }
 
   syncable::Directory* directory() {
     return dir_maker_.directory();
diff --git a/sync/engine/directory_commit_contribution_unittest.cc b/sync/engine/directory_commit_contribution_unittest.cc
index be04c73c420688..b5612b6d66c9c1 100644
--- a/sync/engine/directory_commit_contribution_unittest.cc
+++ b/sync/engine/directory_commit_contribution_unittest.cc
@@ -20,7 +20,7 @@ namespace syncer {
 
 class DirectoryCommitContributionTest : public ::testing::Test {
  public:
-  virtual void SetUp() override {
+  void SetUp() override {
     dir_maker_.SetUp();
 
     syncable::WriteTransaction trans(FROM_HERE, syncable::UNITTEST, dir());
@@ -30,9 +30,7 @@ class DirectoryCommitContributionTest : public ::testing::Test {
     CreateTypeRoot(&trans, dir(), BOOKMARKS);
   }
 
-  virtual void TearDown() override {
-    dir_maker_.TearDown();
-  }
+  void TearDown() override { dir_maker_.TearDown(); }
 
  protected:
   int64 CreateUnsyncedItemWithAttachments(
diff --git a/sync/engine/directory_update_handler_unittest.cc b/sync/engine/directory_update_handler_unittest.cc
index e7518ff6b9ff13..8b6e6ffe88572d 100644
--- a/sync/engine/directory_update_handler_unittest.cc
+++ b/sync/engine/directory_update_handler_unittest.cc
@@ -44,15 +44,11 @@ class DirectoryUpdateHandlerProcessUpdateTest : public ::testing::Test {
       : ui_worker_(new FakeModelWorker(GROUP_UI)) {
   }
 
-  virtual ~DirectoryUpdateHandlerProcessUpdateTest() {}
+  ~DirectoryUpdateHandlerProcessUpdateTest() override {}
 
-  virtual void SetUp() override {
-    dir_maker_.SetUp();
-  }
+  void SetUp() override { dir_maker_.SetUp(); }
 
-  virtual void TearDown() override {
-    dir_maker_.TearDown();
-  }
+  void TearDown() override { dir_maker_.TearDown(); }
 
   syncable::Directory* dir() {
     return dir_maker_.directory();
@@ -486,7 +482,7 @@ class DirectoryUpdateHandlerApplyUpdateTest : public ::testing::Test {
         articles_emitter_(ARTICLES, &type_observers_),
         update_handler_map_deleter_(&update_handler_map_) {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     dir_maker_.SetUp();
     entry_factory_.reset(new TestEntryFactory(directory()));
 
@@ -506,9 +502,7 @@ class DirectoryUpdateHandlerApplyUpdateTest : public ::testing::Test {
             directory(), ARTICLES, ui_worker_, &articles_emitter_)));
   }
 
-  virtual void TearDown() override {
-    dir_maker_.TearDown();
-  }
+  void TearDown() override { dir_maker_.TearDown(); }
 
   const UpdateCounters& GetBookmarksUpdateCounters() {
     return bookmarks_emitter_.GetUpdateCounters();
diff --git a/sync/engine/entity_tracker_unittest.cc b/sync/engine/entity_tracker_unittest.cc
index 7a1b04b56a333e..873875b64b181f 100644
--- a/sync/engine/entity_tracker_unittest.cc
+++ b/sync/engine/entity_tracker_unittest.cc
@@ -34,7 +34,7 @@ class EntityTrackerTest : public ::testing::Test {
     specifics.mutable_preference()->set_value("pref.value");
   }
 
-  virtual ~EntityTrackerTest() {}
+  ~EntityTrackerTest() override {}
 
   const std::string kServerId;
   const std::string kClientTag;
diff --git a/sync/engine/get_updates_processor_unittest.cc b/sync/engine/get_updates_processor_unittest.cc
index c146c56baf83a5..566a295c92d39d 100644
--- a/sync/engine/get_updates_processor_unittest.cc
+++ b/sync/engine/get_updates_processor_unittest.cc
@@ -40,7 +40,7 @@ class GetUpdatesProcessorTest : public ::testing::Test {
     kTestStartTime(base::TimeTicks::Now()),
     update_handler_deleter_(&update_handler_map_) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     AddUpdateHandler(AUTOFILL);
     AddUpdateHandler(BOOKMARKS);
     AddUpdateHandler(PREFERENCES);
@@ -386,9 +386,9 @@ TEST_F(GetUpdatesProcessorTest, NormalResponseTest) {
 class GetUpdatesProcessorApplyUpdatesTest : public GetUpdatesProcessorTest {
  public:
   GetUpdatesProcessorApplyUpdatesTest() {}
-  virtual ~GetUpdatesProcessorApplyUpdatesTest() {}
+  ~GetUpdatesProcessorApplyUpdatesTest() override {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     bookmarks_handler_ = AddUpdateHandler(BOOKMARKS);
     autofill_handler_ = AddUpdateHandler(AUTOFILL);
   }
@@ -475,7 +475,7 @@ TEST_F(GetUpdatesProcessorApplyUpdatesTest, Poll) {
 class DownloadUpdatesDebugInfoTest : public ::testing::Test {
  public:
   DownloadUpdatesDebugInfoTest() {}
-  virtual ~DownloadUpdatesDebugInfoTest() {}
+  ~DownloadUpdatesDebugInfoTest() override {}
 
   sessions::StatusController* status() {
     return &status_;
diff --git a/sync/engine/model_type_sync_proxy_impl_unittest.cc b/sync/engine/model_type_sync_proxy_impl_unittest.cc
index 860cc703cce50b..1b30219a8a0485 100644
--- a/sync/engine/model_type_sync_proxy_impl_unittest.cc
+++ b/sync/engine/model_type_sync_proxy_impl_unittest.cc
@@ -42,7 +42,7 @@ static const ModelType kModelType = PREFERENCES;
 class ModelTypeSyncProxyImplTest : public ::testing::Test {
  public:
   ModelTypeSyncProxyImplTest();
-  virtual ~ModelTypeSyncProxyImplTest();
+  ~ModelTypeSyncProxyImplTest() override;
 
   // Initialize with no local state.  The type sync proxy will be unable to
   // commit until it receives notification that initial sync has completed.
diff --git a/sync/engine/model_type_sync_worker_impl_unittest.cc b/sync/engine/model_type_sync_worker_impl_unittest.cc
index 5c62c9a068a411..934f3fa01cfc43 100644
--- a/sync/engine/model_type_sync_worker_impl_unittest.cc
+++ b/sync/engine/model_type_sync_worker_impl_unittest.cc
@@ -57,7 +57,7 @@ namespace syncer {
 class ModelTypeSyncWorkerImplTest : public ::testing::Test {
  public:
   ModelTypeSyncWorkerImplTest();
-  virtual ~ModelTypeSyncWorkerImplTest();
+  ~ModelTypeSyncWorkerImplTest() override;
 
   // One of these Initialize functions should be called at the beginning of
   // each test.
diff --git a/sync/engine/sync_scheduler_unittest.cc b/sync/engine/sync_scheduler_unittest.cc
index 3c86748264454b..21d7f28513c756 100644
--- a/sync/engine/sync_scheduler_unittest.cc
+++ b/sync/engine/sync_scheduler_unittest.cc
@@ -120,7 +120,7 @@ class SyncSchedulerTest : public testing::Test {
     MOCK_METHOD1(GetDelay, TimeDelta(const TimeDelta&));
   };
 
-  virtual void SetUp() {
+  void SetUp() override {
     dir_maker_.SetUp();
     syncer_ = new testing::StrictMock<MockSyncer>();
     delay_ = NULL;
@@ -172,7 +172,7 @@ class SyncSchedulerTest : public testing::Test {
     return TestTimeouts::action_timeout();
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     PumpLoop();
     scheduler_.reset();
     PumpLoop();
@@ -895,14 +895,14 @@ TEST_F(SyncSchedulerTest, ConfigurationMode) {
 }
 
 class BackoffTriggersSyncSchedulerTest : public SyncSchedulerTest {
-  virtual void SetUp() {
+  void SetUp() override {
     SyncSchedulerTest::SetUp();
     UseMockDelayProvider();
     EXPECT_CALL(*delay(), GetDelay(_))
         .WillRepeatedly(Return(TimeDelta::FromMilliseconds(10)));
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     StopSyncScheduler();
     SyncSchedulerTest::TearDown();
   }
diff --git a/sync/engine/syncer_proto_util_unittest.cc b/sync/engine/syncer_proto_util_unittest.cc
index 81b25662894bdb..a5c1fd45b42351 100644
--- a/sync/engine/syncer_proto_util_unittest.cc
+++ b/sync/engine/syncer_proto_util_unittest.cc
@@ -184,13 +184,9 @@ TEST(SyncerProtoUtil, NameExtractionTwoNames) {
 
 class SyncerProtoUtilTest : public testing::Test {
  public:
-  virtual void SetUp() {
-    dir_maker_.SetUp();
-  }
+  void SetUp() override { dir_maker_.SetUp(); }
 
-  virtual void TearDown() {
-    dir_maker_.TearDown();
-  }
+  void TearDown() override { dir_maker_.TearDown(); }
 
   syncable::Directory* directory() {
     return dir_maker_.directory();
diff --git a/sync/engine/syncer_unittest.cc b/sync/engine/syncer_unittest.cc
index f8682a67cd2d74..965728b312cf2b 100644
--- a/sync/engine/syncer_unittest.cc
+++ b/sync/engine/syncer_unittest.cc
@@ -277,7 +277,7 @@ class SyncerTest : public testing::Test,
             session_.get()));
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     dir_maker_.SetUp();
     mock_server_.reset(new MockConnectionManager(directory(),
                                                  &cancelation_signal_));
@@ -324,7 +324,7 @@ class SyncerTest : public testing::Test,
     mock_server_->SetKeystoreKey("encryption_key");
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     model_type_registry_->UnregisterDirectoryTypeDebugInfoObserver(
         &debug_info_cache_);
     mock_server_.reset();
diff --git a/sync/engine/syncer_util_unittest.cc b/sync/engine/syncer_util_unittest.cc
index 9fda35f6bf76b1..7580755511f664 100644
--- a/sync/engine/syncer_util_unittest.cc
+++ b/sync/engine/syncer_util_unittest.cc
@@ -17,14 +17,12 @@ namespace syncer {
 
 class GetUpdatePositionTest : public ::testing::Test {
  public:
-  virtual void SetUp() {
+  void SetUp() override {
     dir_maker_.SetUp();
     entry_factory_.reset(new TestEntryFactory(directory()));
   }
 
-  virtual void TearDown() {
-    dir_maker_.TearDown();
-  }
+  void TearDown() override { dir_maker_.TearDown(); }
 
   syncable::Directory* directory() {
     return dir_maker_.directory();
diff --git a/sync/internal_api/attachments/attachment_downloader_impl_unittest.cc b/sync/internal_api/attachments/attachment_downloader_impl_unittest.cc
index 96ea5eaef506b2..1d026eb56a5f6d 100644
--- a/sync/internal_api/attachments/attachment_downloader_impl_unittest.cc
+++ b/sync/internal_api/attachments/attachment_downloader_impl_unittest.cc
@@ -154,8 +154,8 @@ class AttachmentDownloaderImplTest : public testing::Test {
 
   AttachmentDownloaderImplTest() : num_completed_downloads_(0) {}
 
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   AttachmentDownloader* downloader() { return attachment_downloader_.get(); }
 
diff --git a/sync/internal_api/attachments/attachment_service_impl_unittest.cc b/sync/internal_api/attachments/attachment_service_impl_unittest.cc
index 713d1550602747..e72bb8fe578f46 100644
--- a/sync/internal_api/attachments/attachment_service_impl_unittest.cc
+++ b/sync/internal_api/attachments/attachment_service_impl_unittest.cc
@@ -176,14 +176,14 @@ class AttachmentServiceImplTest : public testing::Test,
  protected:
   AttachmentServiceImplTest() {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     network_change_notifier_.reset(net::NetworkChangeNotifier::CreateMock());
     InitializeAttachmentService(make_scoped_ptr(new MockAttachmentUploader()),
                                 make_scoped_ptr(new MockAttachmentDownloader()),
                                 this);
   }
 
-  virtual void TearDown() override {
+  void TearDown() override {
     attachment_service_.reset();
     ASSERT_FALSE(attachment_store_);
     ASSERT_FALSE(attachment_uploader_);
diff --git a/sync/internal_api/attachments/attachment_service_proxy_unittest.cc b/sync/internal_api/attachments/attachment_service_proxy_unittest.cc
index 3d5cd552888829..d1b935637c78ae 100644
--- a/sync/internal_api/attachments/attachment_service_proxy_unittest.cc
+++ b/sync/internal_api/attachments/attachment_service_proxy_unittest.cc
@@ -91,7 +91,7 @@ class AttachmentServiceProxyTest : public testing::Test,
  protected:
   AttachmentServiceProxyTest() {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     CalledOnValidThread();
     stub_thread.reset(new base::Thread("attachment service stub thread"));
     stub_thread->Start();
@@ -108,8 +108,7 @@ class AttachmentServiceProxyTest : public testing::Test,
     count_callback_drop = 0;
   }
 
-  virtual void TearDown()
-      override {
+  void TearDown() override {
     // We must take care to call the stub's destructor on the stub_thread
     // because that's the thread to which its WeakPtrs are bound.
     if (stub) {
diff --git a/sync/internal_api/attachments/attachment_store_handle_unittest.cc b/sync/internal_api/attachments/attachment_store_handle_unittest.cc
index 9f82a782d42a90..2224e54e1c04aa 100644
--- a/sync/internal_api/attachments/attachment_store_handle_unittest.cc
+++ b/sync/internal_api/attachments/attachment_store_handle_unittest.cc
@@ -88,7 +88,7 @@ class AttachmentStoreHandleTest : public testing::Test {
         read_all_metadata_call_count_(0),
         dtor_call_count_(0) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     scoped_ptr<AttachmentStoreBase> backend(new MockAttachmentStore(
         base::Bind(&AttachmentStoreHandleTest::InitCalled,
                    base::Unretained(this)),
diff --git a/sync/internal_api/attachments/attachment_uploader_impl_unittest.cc b/sync/internal_api/attachments/attachment_uploader_impl_unittest.cc
index 2daff32b4a188d..4af6cd88408e67 100644
--- a/sync/internal_api/attachments/attachment_uploader_impl_unittest.cc
+++ b/sync/internal_api/attachments/attachment_uploader_impl_unittest.cc
@@ -194,8 +194,8 @@ class AttachmentUploaderImplTest : public testing::Test,
 
  protected:
   AttachmentUploaderImplTest();
-  virtual void SetUp();
-  virtual void TearDown();
+  void SetUp() override;
+  void TearDown() override;
 
   // Run the message loop until UploadDone has been invoked |num_uploads| times.
   void RunAndWaitFor(int num_uploads);
diff --git a/sync/internal_api/attachments/fake_attachment_downloader_unittest.cc b/sync/internal_api/attachments/fake_attachment_downloader_unittest.cc
index 7ab6235c3b463c..1436a497eb12bd 100644
--- a/sync/internal_api/attachments/fake_attachment_downloader_unittest.cc
+++ b/sync/internal_api/attachments/fake_attachment_downloader_unittest.cc
@@ -16,9 +16,9 @@ class FakeAttachmentDownloaderTest : public testing::Test {
  protected:
   FakeAttachmentDownloaderTest() {}
 
-  virtual void SetUp() override {}
+  void SetUp() override {}
 
-  virtual void TearDown() override {}
+  void TearDown() override {}
 
   AttachmentDownloader* downloader() {
     return &attachment_downloader_;
diff --git a/sync/internal_api/attachments/fake_attachment_uploader_unittest.cc b/sync/internal_api/attachments/fake_attachment_uploader_unittest.cc
index 2cfd75ece89d2a..45b4d303822d0c 100644
--- a/sync/internal_api/attachments/fake_attachment_uploader_unittest.cc
+++ b/sync/internal_api/attachments/fake_attachment_uploader_unittest.cc
@@ -21,7 +21,7 @@ const char kAttachmentData[] = "some data";
 
 class FakeAttachmentUploaderTest : public testing::Test {
  protected:
-  virtual void SetUp() {
+  void SetUp() override {
     upload_callback_count = 0;
     upload_callback = base::Bind(&FakeAttachmentUploaderTest::Increment,
                                  base::Unretained(this),
diff --git a/sync/internal_api/http_bridge_unittest.cc b/sync/internal_api/http_bridge_unittest.cc
index 9015cbf5806dff..26255464165fd3 100644
--- a/sync/internal_api/http_bridge_unittest.cc
+++ b/sync/internal_api/http_bridge_unittest.cc
@@ -31,13 +31,13 @@ class SyncHttpBridgeTest : public testing::Test {
         io_thread_("IO thread") {
   }
 
-  virtual void SetUp() {
+  void SetUp() override {
     base::Thread::Options options;
     options.message_loop_type = base::MessageLoop::TYPE_IO;
     io_thread_.StartWithOptions(options);
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     if (fake_default_request_context_getter_) {
       GetIOThreadLoop()->ReleaseSoon(FROM_HERE,
           fake_default_request_context_getter_);
diff --git a/sync/internal_api/protocol_event_buffer_unittest.cc b/sync/internal_api/protocol_event_buffer_unittest.cc
index d6d403401283ee..b197ec0bb160d1 100644
--- a/sync/internal_api/protocol_event_buffer_unittest.cc
+++ b/sync/internal_api/protocol_event_buffer_unittest.cc
@@ -16,7 +16,7 @@ namespace syncer {
 class ProtocolEventBufferTest : public ::testing::Test {
  public:
   ProtocolEventBufferTest();
-  virtual ~ProtocolEventBufferTest();
+  ~ProtocolEventBufferTest() override;
 
   static scoped_ptr<ProtocolEvent> MakeTestEvent(int64 id);
   static bool HasId(const ProtocolEvent& event, int64 id);
diff --git a/sync/internal_api/public/base/cancelation_signal_unittest.cc b/sync/internal_api/public/base/cancelation_signal_unittest.cc
index 58a35cc2eaa82b..244c9258331c0a 100644
--- a/sync/internal_api/public/base/cancelation_signal_unittest.cc
+++ b/sync/internal_api/public/base/cancelation_signal_unittest.cc
@@ -93,7 +93,7 @@ bool BlockingTask::WasStarted() {
 class CancelationSignalTest : public ::testing::Test {
  public:
   CancelationSignalTest();
-  virtual ~CancelationSignalTest();
+  ~CancelationSignalTest() override;
 
   // Starts the blocking task on a background thread.  Does not wait for the
   // task to start.
diff --git a/sync/internal_api/public/util/weak_handle_unittest.cc b/sync/internal_api/public/util/weak_handle_unittest.cc
index 72003291e1951e..4be4fb792d1840 100644
--- a/sync/internal_api/public/util/weak_handle_unittest.cc
+++ b/sync/internal_api/public/util/weak_handle_unittest.cc
@@ -47,7 +47,7 @@ class Derived : public Base, public base::SupportsWeakPtr<Derived> {};
 
 class WeakHandleTest : public ::testing::Test {
  protected:
-  virtual void TearDown() {
+  void TearDown() override {
     // Process any last-minute posted tasks.
     PumpLoop();
   }
diff --git a/sync/internal_api/sync_context_proxy_impl_unittest.cc b/sync/internal_api/sync_context_proxy_impl_unittest.cc
index 49ed02de0727c2..1ab12987c266a4 100644
--- a/sync/internal_api/sync_context_proxy_impl_unittest.cc
+++ b/sync/internal_api/sync_context_proxy_impl_unittest.cc
@@ -23,7 +23,7 @@ class SyncContextProxyImplTest : public ::testing::Test {
       : sync_task_runner_(base::ThreadTaskRunnerHandle::Get()),
         type_task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     dir_maker_.SetUp();
     registry_.reset(new ModelTypeRegistry(
         workers_, dir_maker_.directory(), &nudge_handler_));
@@ -31,7 +31,7 @@ class SyncContextProxyImplTest : public ::testing::Test {
         new SyncContextProxyImpl(sync_task_runner_, registry_->AsWeakPtr()));
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     context_proxy_.reset();
     registry_.reset();
     dir_maker_.TearDown();
diff --git a/sync/internal_api/sync_manager_impl_unittest.cc b/sync/internal_api/sync_manager_impl_unittest.cc
index 0f58bb93ecea86..ac5b31aeb36693 100644
--- a/sync/internal_api/sync_manager_impl_unittest.cc
+++ b/sync/internal_api/sync_manager_impl_unittest.cc
@@ -199,13 +199,9 @@ int64 MakeServerNode(UserShare* share, ModelType model_type,
 
 class SyncApiTest : public testing::Test {
  public:
-  virtual void SetUp() {
-    test_user_share_.SetUp();
-  }
+  void SetUp() override { test_user_share_.SetUp(); }
 
-  virtual void TearDown() {
-    test_user_share_.TearDown();
-  }
+  void TearDown() override { test_user_share_.TearDown(); }
 
  protected:
   // Create an entry with the given |model_type|, |client_tag| and
diff --git a/sync/internal_api/sync_rollback_manager_base_unittest.cc b/sync/internal_api/sync_rollback_manager_base_unittest.cc
index 2f682add6c31f8..fd1c12f849d33d 100644
--- a/sync/internal_api/sync_rollback_manager_base_unittest.cc
+++ b/sync/internal_api/sync_rollback_manager_base_unittest.cc
@@ -33,7 +33,7 @@ class SyncTestRollbackManager : public SyncRollbackManagerBase {
 
 class SyncRollbackManagerBaseTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     SyncManager::InitArgs args;
     args.database_location = base::FilePath(base::FilePath::kCurrentDirectory);
     args.service_url = GURL("https://example.com/");
diff --git a/sync/sessions/model_type_registry_unittest.cc b/sync/sessions/model_type_registry_unittest.cc
index f9a041f5b8ebad..47be4792005ff6 100644
--- a/sync/sessions/model_type_registry_unittest.cc
+++ b/sync/sessions/model_type_registry_unittest.cc
@@ -20,8 +20,8 @@ namespace syncer {
 class ModelTypeRegistryTest : public ::testing::Test {
  public:
   ModelTypeRegistryTest();
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  void SetUp() override;
+  void TearDown() override;
 
   ModelTypeRegistry* registry();
 
diff --git a/sync/syncable/deferred_on_disk_directory_backing_store_unittest.cc b/sync/syncable/deferred_on_disk_directory_backing_store_unittest.cc
index b58ccb7624bd2c..fbba75e537ce07 100644
--- a/sync/syncable/deferred_on_disk_directory_backing_store_unittest.cc
+++ b/sync/syncable/deferred_on_disk_directory_backing_store_unittest.cc
@@ -20,14 +20,12 @@ static const base::FilePath::CharType kSyncDataFolderName[] =
 
 class DeferredOnDiskDirectoryBackingStoreTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     CHECK(temp_dir_.CreateUniqueTempDir());
     db_path_ = temp_dir_.path().Append(kSyncDataFolderName);
   }
 
-  virtual void TearDown() override {
-    STLDeleteValues(&handles_map_);
-  }
+  void TearDown() override { STLDeleteValues(&handles_map_); }
 
   base::ScopedTempDir temp_dir_;
   base::FilePath db_path_;
diff --git a/sync/syncable/directory_backing_store_unittest.cc b/sync/syncable/directory_backing_store_unittest.cc
index 9b92e56719404e..8f679f170d17f3 100644
--- a/sync/syncable/directory_backing_store_unittest.cc
+++ b/sync/syncable/directory_backing_store_unittest.cc
@@ -32,9 +32,7 @@ SYNC_EXPORT_PRIVATE extern const int32 kCurrentDBVersion;
 
 class MigrationTest : public testing::TestWithParam<int> {
  public:
-  virtual void SetUp() {
-    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
-  }
+  void SetUp() override { ASSERT_TRUE(temp_dir_.CreateUniqueTempDir()); }
 
  protected:
   std::string GetUsername() {
diff --git a/sync/syncable/directory_unittest.h b/sync/syncable/directory_unittest.h
index 81e388823a4517..e5427a8d76bea7 100644
--- a/sync/syncable/directory_unittest.h
+++ b/sync/syncable/directory_unittest.h
@@ -35,10 +35,10 @@ class SyncableDirectoryTest : public testing::Test {
   static const char kDirectoryName[];
 
   SyncableDirectoryTest();
-  virtual ~SyncableDirectoryTest();
+  ~SyncableDirectoryTest() override;
 
-  virtual void SetUp();
-  virtual void TearDown();
+  void SetUp() override;
+  void TearDown() override;
 
   // Destroys any currently opened directory, creates and opens a new one.
   //
diff --git a/sync/syncable/parent_child_index_unittest.cc b/sync/syncable/parent_child_index_unittest.cc
index 5ae9d27bd87faa..c0c9e82406cc46 100644
--- a/sync/syncable/parent_child_index_unittest.cc
+++ b/sync/syncable/parent_child_index_unittest.cc
@@ -21,7 +21,7 @@ static const std::string kCacheGuid = "8HhNIHlEOCGQbIAALr9QEg==";
 
 class ParentChildIndexTest : public testing::Test {
  public:
-  virtual void TearDown() {
+  void TearDown() override {
     // To make memory management easier, we take ownership of all EntryKernels
     // returned by our factory methods and delete them here.
     STLDeleteElements(&owned_entry_kernels_);
diff --git a/sync/syncable/syncable_unittest.cc b/sync/syncable/syncable_unittest.cc
index 5706106034a907..d1c6ae86d187bc 100644
--- a/sync/syncable/syncable_unittest.cc
+++ b/sync/syncable/syncable_unittest.cc
@@ -146,7 +146,7 @@ class OnDiskSyncableDirectoryTest : public SyncableDirectoryTest {
  protected:
   // SetUp() is called before each test case is run.
   // The sqlite3 DB is deleted before each test is run.
-  virtual void SetUp() {
+  void SetUp() override {
     SyncableDirectoryTest::SetUp();
     ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
     file_path_ = temp_dir_.path().Append(
@@ -155,7 +155,7 @@ class OnDiskSyncableDirectoryTest : public SyncableDirectoryTest {
     CreateDirectory();
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     // This also closes file handles.
     dir()->SaveChanges();
     dir().reset();
@@ -545,12 +545,10 @@ TEST_F(OnDiskSyncableDirectoryTest, TestSaveChangesFailureWithPurge) {
 
 class SyncableDirectoryManagement : public testing::Test {
  public:
-  virtual void SetUp() {
-    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
-  }
+  void SetUp() override { ASSERT_TRUE(temp_dir_.CreateUniqueTempDir()); }
+
+  void TearDown() override {}
 
-  virtual void TearDown() {
-  }
  protected:
   base::MessageLoop message_loop_;
   base::ScopedTempDir temp_dir_;