| Index: chrome/browser/extensions/extension_service.h | 
| diff --git a/chrome/browser/extensions/extension_service.h b/chrome/browser/extensions/extension_service.h | 
| index 49f029bd043bfa97377cd878de333409362ae53d..7b4e044cb04952f3427fcfe2425b736f3d8a9897 100644 | 
| --- a/chrome/browser/extensions/extension_service.h | 
| +++ b/chrome/browser/extensions/extension_service.h | 
| @@ -17,6 +17,7 @@ | 
| #include "base/memory/ref_counted.h" | 
| #include "base/memory/weak_ptr.h" | 
| #include "base/prefs/public/pref_change_registrar.h" | 
| +#include "base/prefs/public/pref_observer.h" | 
| #include "base/string16.h" | 
| #include "chrome/browser/extensions/app_shortcut_manager.h" | 
| #include "chrome/browser/extensions/app_sync_bundle.h" | 
| @@ -140,7 +141,8 @@ class ExtensionServiceInterface : public syncer::SyncableService { | 
| class ExtensionService | 
| : public ExtensionServiceInterface, | 
| public extensions::ExternalProviderInterface::VisitorInterface, | 
| -      public content::NotificationObserver { | 
| +      public content::NotificationObserver, | 
| +      public PrefObserver { | 
| public: | 
| // The name of the directory inside the profile where extensions are | 
| // installed to. | 
| @@ -621,6 +623,10 @@ class ExtensionService | 
| const content::NotificationSource& source, | 
| const content::NotificationDetails& details) OVERRIDE; | 
|  | 
| +  // PrefObserver | 
| +  virtual void OnPreferenceChanged(PrefServiceBase* service, | 
| +                                   const std::string& pref_name) OVERRIDE; | 
| + | 
| // Whether there are any apps installed. Component apps are not included. | 
| bool HasApps() const; | 
|  | 
|  |