Update {virtual,override} to follow C++11 style in chrome_elf.

The Google style guide states that only one of {virtual,override,final} should be used for each declaration, since override implies virtual and final implies both virtual and override.

This patch was manually generated using a regex and a text editor.

BUG=417463

Review URL: https://codereview.chromium.org/1106533003

Cr-Commit-Position: refs/heads/master@{#326454}

chrome_elf/chrome_elf_util_unittest.cc

@@ -57,7 +57,7 @@ class ChromeElfUtilTest :
                                              const char*,
                                              const char*> > {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     override_manager_.OverrideRegistry(HKEY_LOCAL_MACHINE);
     override_manager_.OverrideRegistry(HKEY_CURRENT_USER);
     const char* app;

chrome_elf/create_file/chrome_create_file_unittest.cc

@@ -76,7 +76,7 @@ class ChromeCreateFileTest : public PlatformTest {
         path);
   }
 
-  virtual void SetUp() override {
+  void SetUp() override {
     original_thread_ = base::PlatformThread::CurrentId();
     InitCache();
     PlatformTest::SetUp();

chrome_elf/ntdll_cache_unittest.cc

@@ -13,7 +13,7 @@ namespace {
 
 class NTDLLCacheTest : public testing::Test {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     InitCache();
   }