diff --git a/apps/app_restore_service.cc b/apps/app_restore_service.cc
index 524ab964780269..50cb7d0396fa22 100644
--- a/apps/app_restore_service.cc
+++ b/apps/app_restore_service.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/extension_set.h"
 #include "extensions/common/extension.h"
 
diff --git a/apps/app_restore_service_browsertest.cc b/apps/app_restore_service_browsertest.cc
index 27b179a502c31f..381efbf3e33171 100644
--- a/apps/app_restore_service_browsertest.cc
+++ b/apps/app_restore_service_browsertest.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/extensions/api/file_system/file_system_api.h"
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_test_message_listener.h"
+#include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/test/test_utils.h"
 #include "extensions/common/extension.h"
diff --git a/apps/saved_files_service.cc b/apps/saved_files_service.cc
index b4dfab71b2d3b0..86e1bd63346485 100644
--- a/apps/saved_files_service.cc
+++ b/apps/saved_files_service.cc
@@ -15,6 +15,7 @@
 #include "chrome/browser/extensions/extension_prefs.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
+#include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/notification_service.h"
 #include "extensions/common/permissions/api_permission.h"
 #include "extensions/common/permissions/permission_set.h"
diff --git a/chrome/browser/extensions/api/file_system/file_system_apitest.cc b/chrome/browser/extensions/api/file_system/file_system_apitest.cc
index b3348baab4751e..762b515f687e3d 100644
--- a/chrome/browser/extensions/api/file_system/file_system_apitest.cc
+++ b/chrome/browser/extensions/api/file_system/file_system_apitest.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/file_system/file_system_api.h"
 #include "chrome/browser/extensions/extension_prefs.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_service.h"
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index 500534e2c079c7..800582580567a8 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -34,6 +34,14 @@ bool ChromeExtensionsBrowserClient::IsShuttingDown() {
   return g_browser_process->IsShuttingDown();
 }
 
+bool ChromeExtensionsBrowserClient::AreExtensionsDisabled(
+    const CommandLine& command_line,
+    content::BrowserContext* context) {
+  Profile* profile = static_cast<Profile*>(context);
+  return command_line.HasSwitch(switches::kDisableExtensions) ||
+      profile->GetPrefs()->GetBoolean(prefs::kDisableExtensions);
+}
+
 bool ChromeExtensionsBrowserClient::IsValidContext(
     content::BrowserContext* context) {
   Profile* profile = static_cast<Profile*>(context);
@@ -62,6 +70,11 @@ content::BrowserContext* ChromeExtensionsBrowserClient::GetOriginalContext(
   return static_cast<Profile*>(context)->GetOriginalProfile();
 }
 
+PrefService* ChromeExtensionsBrowserClient::GetPrefServiceForContext(
+    content::BrowserContext* context) {
+  return static_cast<Profile*>(context)->GetPrefs();
+}
+
 bool ChromeExtensionsBrowserClient::DeferLoadingBackgroundHosts(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.h b/chrome/browser/extensions/chrome_extensions_browser_client.h
index dc9d4fd30cbf39..24aa6e8a86ec8e 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.h
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.h
@@ -12,6 +12,8 @@
 #include "chrome/browser/extensions/chrome_notification_observer.h"
 #include "extensions/browser/extensions_browser_client.h"
 
+class CommandLine;
+
 namespace content {
 class BrowserContext;
 }
@@ -31,6 +33,8 @@ class ChromeExtensionsBrowserClient : public ExtensionsBrowserClient {
 
   // BrowserClient overrides:
   virtual bool IsShuttingDown() OVERRIDE;
+  virtual bool AreExtensionsDisabled(const CommandLine& command_line,
+                                     content::BrowserContext* context) OVERRIDE;
   virtual bool IsValidContext(content::BrowserContext* context) OVERRIDE;
   virtual bool IsSameContext(content::BrowserContext* first,
                              content::BrowserContext* second) OVERRIDE;
@@ -40,6 +44,8 @@ class ChromeExtensionsBrowserClient : public ExtensionsBrowserClient {
       content::BrowserContext* context) OVERRIDE;
   virtual content::BrowserContext* GetOriginalContext(
       content::BrowserContext* context) OVERRIDE;
+  virtual PrefService* GetPrefServiceForContext(
+      content::BrowserContext* context) OVERRIDE;
   virtual bool DeferLoadingBackgroundHosts(
       content::BrowserContext* context) const OVERRIDE;
   virtual bool DidVersionUpdate(content::BrowserContext* context) OVERRIDE;
diff --git a/chrome/browser/extensions/extension_pref_value_map_factory.cc b/chrome/browser/extensions/extension_pref_value_map_factory.cc
index fdc9c5cb100a52..bc926ea45e348e 100644
--- a/chrome/browser/extensions/extension_pref_value_map_factory.cc
+++ b/chrome/browser/extensions/extension_pref_value_map_factory.cc
@@ -5,7 +5,6 @@
 #include "chrome/browser/extensions/extension_pref_value_map_factory.h"
 
 #include "chrome/browser/extensions/extension_pref_value_map.h"
-#include "chrome/browser/profiles/profile.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
 
 ExtensionPrefValueMapFactory::ExtensionPrefValueMapFactory()
diff --git a/chrome/browser/extensions/extension_pref_value_map_factory.h b/chrome/browser/extensions/extension_pref_value_map_factory.h
index 5aefc385251f32..368926530aab58 100644
--- a/chrome/browser/extensions/extension_pref_value_map_factory.h
+++ b/chrome/browser/extensions/extension_pref_value_map_factory.h
@@ -9,7 +9,6 @@
 #include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
 
 class ExtensionPrefValueMap;
-class Profile;
 
 // The usual factory boilerplate for ExtensionPrefValueMap.
 class ExtensionPrefValueMapFactory : public BrowserContextKeyedServiceFactory {
diff --git a/chrome/browser/extensions/extension_prefs.cc b/chrome/browser/extensions/extension_prefs.cc
index 21158a511493b1..b84e04399a2a17 100644
--- a/chrome/browser/extensions/extension_prefs.cc
+++ b/chrome/browser/extensions/extension_prefs.cc
@@ -348,8 +348,8 @@ ExtensionPrefs::~ExtensionPrefs() {
 }
 
 // static
-ExtensionPrefs* ExtensionPrefs::Get(Profile* profile) {
-  return ExtensionPrefsFactory::GetInstance()->GetForProfile(profile);
+ExtensionPrefs* ExtensionPrefs::Get(content::BrowserContext* context) {
+  return ExtensionPrefsFactory::GetInstance()->GetForBrowserContext(context);
 }
 
 static base::FilePath::StringType MakePathRelative(const base::FilePath& parent,
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index f7130a59fdc44f..6906f9019964aa 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -24,7 +24,10 @@
 
 class ExtensionPrefValueMap;
 class PrefService;
-class Profile;
+
+namespace content {
+class BrowserContext;
+}
 
 namespace user_prefs {
 class PrefRegistrySyncable;
@@ -158,8 +161,8 @@ class ExtensionPrefs : public ExtensionScopedPrefs,
 
   virtual ~ExtensionPrefs();
 
-  // Convenience function to get the ExtensionPrefs for a Profile.
-  static ExtensionPrefs* Get(Profile* profile);
+  // Convenience function to get the ExtensionPrefs for a BrowserContext.
+  static ExtensionPrefs* Get(content::BrowserContext* context);
 
   // Returns all installed extensions from extension preferences provided by
   // |pref_service|. This is exposed for ProtectedPrefsWatcher because it needs
diff --git a/chrome/browser/extensions/extension_prefs_factory.cc b/chrome/browser/extensions/extension_prefs_factory.cc
index c3cfe967cb003a..e0bb1ba10339c5 100644
--- a/chrome/browser/extensions/extension_prefs_factory.cc
+++ b/chrome/browser/extensions/extension_prefs_factory.cc
@@ -10,19 +10,18 @@
 #include "chrome/browser/extensions/extension_prefs_factory.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
-#include "chrome/browser/profiles/profile.h"
-#include "chrome/common/chrome_switches.h"
-#include "chrome/common/pref_names.h"
 #include "components/browser_context_keyed_service/browser_context_dependency_manager.h"
+#include "content/public/browser/browser_context.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/common/constants.h"
 
 namespace extensions {
 
 // static
-ExtensionPrefs* ExtensionPrefsFactory::GetForProfile(Profile* profile) {
+ExtensionPrefs* ExtensionPrefsFactory::GetForBrowserContext(
+    content::BrowserContext* context) {
   return static_cast<ExtensionPrefs*>(
-      GetInstance()->GetServiceForBrowserContext(profile, true));
+      GetInstance()->GetServiceForBrowserContext(context, true));
 }
 
 // static
@@ -46,21 +45,19 @@ ExtensionPrefsFactory::~ExtensionPrefsFactory() {
 
 BrowserContextKeyedService* ExtensionPrefsFactory::BuildServiceInstanceFor(
     content::BrowserContext* context) const {
-  Profile* profile = Profile::FromBrowserContext(context);
-  bool extensions_disabled =
-      profile->GetPrefs()->GetBoolean(prefs::kDisableExtensions) ||
-      CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableExtensions);
+  ExtensionsBrowserClient* client = ExtensionsBrowserClient::Get();
   return ExtensionPrefs::Create(
-      profile->GetPrefs(),
-      profile->GetPath().AppendASCII(extensions::kInstallDirectoryName),
-      ExtensionPrefValueMapFactory::GetForBrowserContext(profile),
-      ExtensionsBrowserClient::Get()->CreateAppSorting().Pass(),
-      extensions_disabled);
+      client->GetPrefServiceForContext(context),
+      context->GetPath().AppendASCII(extensions::kInstallDirectoryName),
+      ExtensionPrefValueMapFactory::GetForBrowserContext(context),
+      client->CreateAppSorting().Pass(),
+      client->AreExtensionsDisabled(
+          *CommandLine::ForCurrentProcess(), context));
 }
 
 content::BrowserContext* ExtensionPrefsFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
-  return chrome::GetBrowserContextRedirectedInIncognito(context);
+  return ExtensionsBrowserClient::Get()->GetOriginalContext(context);
 }
 
 }  // namespace extensions
diff --git a/chrome/browser/extensions/extension_prefs_factory.h b/chrome/browser/extensions/extension_prefs_factory.h
index b3057f227b8c0b..911f949a65555a 100644
--- a/chrome/browser/extensions/extension_prefs_factory.h
+++ b/chrome/browser/extensions/extension_prefs_factory.h
@@ -15,7 +15,7 @@ class ExtensionPrefs;
 
 class ExtensionPrefsFactory : public BrowserContextKeyedServiceFactory {
  public:
-  static ExtensionPrefs* GetForProfile(Profile* profile);
+  static ExtensionPrefs* GetForBrowserContext(content::BrowserContext* context);
 
   static ExtensionPrefsFactory* GetInstance();
 
@@ -29,7 +29,7 @@ class ExtensionPrefsFactory : public BrowserContextKeyedServiceFactory {
   virtual ~ExtensionPrefsFactory();
 
   virtual BrowserContextKeyedService* BuildServiceInstanceFor(
-      content::BrowserContext* profile) const OVERRIDE;
+      content::BrowserContext* context) const OVERRIDE;
   virtual content::BrowserContext* GetBrowserContextToUse(
       content::BrowserContext* context) const OVERRIDE;
 };
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 955e43f7d4f531..ed4cf34183a30f 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -337,10 +337,9 @@ ExtensionService::ExtensionService(Profile* profile,
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // Figure out if extension installation should be enabled.
-  if (command_line->HasSwitch(switches::kDisableExtensions) ||
-      profile->GetPrefs()->GetBoolean(prefs::kDisableExtensions)) {
+  if (extensions::ExtensionsBrowserClient::Get()->AreExtensionsDisabled(
+          *command_line, profile))
     extensions_enabled_ = false;
-  }
 
   registrar_.Add(this, chrome::NOTIFICATION_APP_TERMINATING,
                  content::NotificationService::AllBrowserContextsAndSources());
diff --git a/chrome/browser/extensions/extension_sync_service_factory.cc b/chrome/browser/extensions/extension_sync_service_factory.cc
index 5b9b9a4772afbd..cc3ca6523fc324 100644
--- a/chrome/browser/extensions/extension_sync_service_factory.cc
+++ b/chrome/browser/extensions/extension_sync_service_factory.cc
@@ -41,7 +41,7 @@ BrowserContextKeyedService*
   Profile* profile = Profile::FromBrowserContext(context);
   return new ExtensionSyncService(
       profile,
-      extensions::ExtensionPrefsFactory::GetForProfile(profile),
+      extensions::ExtensionPrefsFactory::GetForBrowserContext(profile),
       extensions::ExtensionSystemFactory::GetForProfile(profile)->
           extension_service());
 }
diff --git a/chrome/browser/extensions/extension_toolbar_model.h b/chrome/browser/extensions/extension_toolbar_model.h
index d739ce347cffe3..a69fa794518fbe 100644
--- a/chrome/browser/extensions/extension_toolbar_model.h
+++ b/chrome/browser/extensions/extension_toolbar_model.h
@@ -17,6 +17,7 @@
 class Browser;
 class ExtensionService;
 class PrefService;
+class Profile;
 
 // Model for the browser actions toolbar.
 class ExtensionToolbarModel : public content::NotificationObserver,
diff --git a/chrome/browser/extensions/extension_toolbar_model_factory.cc b/chrome/browser/extensions/extension_toolbar_model_factory.cc
index f4056a6d818656..474c6a0339df43 100644
--- a/chrome/browser/extensions/extension_toolbar_model_factory.cc
+++ b/chrome/browser/extensions/extension_toolbar_model_factory.cc
@@ -35,10 +35,9 @@ ExtensionToolbarModelFactory::~ExtensionToolbarModelFactory() {}
 BrowserContextKeyedService*
     ExtensionToolbarModelFactory::BuildServiceInstanceFor(
         content::BrowserContext* context) const {
-  Profile* profile = Profile::FromBrowserContext(context);
   return new ExtensionToolbarModel(
-      profile,
-      extensions::ExtensionPrefsFactory::GetForProfile(profile));
+      Profile::FromBrowserContext(context),
+      extensions::ExtensionPrefsFactory::GetForBrowserContext(context));
 }
 
 content::BrowserContext* ExtensionToolbarModelFactory::GetBrowserContextToUse(
diff --git a/extensions/browser/extensions_browser_client.h b/extensions/browser/extensions_browser_client.h
index 6331dae5c27827..61641a7931abcc 100644
--- a/extensions/browser/extensions_browser_client.h
+++ b/extensions/browser/extensions_browser_client.h
@@ -7,6 +7,9 @@
 
 #include "base/memory/scoped_ptr.h"
 
+class CommandLine;
+class PrefService;
+
 namespace content {
 class BrowserContext;
 }
@@ -28,6 +31,11 @@ class ExtensionsBrowserClient {
   // Returns true if the embedder has started shutting down.
   virtual bool IsShuttingDown() = 0;
 
+  // Returns true if extensions have been disabled (e.g. via a command-line flag
+  // or preference).
+  virtual bool AreExtensionsDisabled(const CommandLine& command_line,
+                                     content::BrowserContext* context) = 0;
+
   // Returns true if the |context| is known to the embedder.
   virtual bool IsValidContext(content::BrowserContext* context) = 0;
 
@@ -51,6 +59,10 @@ class ExtensionsBrowserClient {
   virtual content::BrowserContext* GetOriginalContext(
       content::BrowserContext* context) = 0;
 
+  // Returns the PrefService associated with |context|.
+  virtual PrefService* GetPrefServiceForContext(
+      content::BrowserContext* context) = 0;
+
   // Returns true if loading background pages should be deferred.
   virtual bool DeferLoadingBackgroundHosts(
       content::BrowserContext* context) const = 0;