| Index: chrome/browser/media_gallery/media_file_system_registry.h | 
| diff --git a/chrome/browser/media_gallery/media_file_system_registry.h b/chrome/browser/media_gallery/media_file_system_registry.h | 
| index 28825b9aa38c1c190f3e0012044050d1d8cdf8fa..bfc266dea24df36a2823283b4f205c2b7457497f 100644 | 
| --- a/chrome/browser/media_gallery/media_file_system_registry.h | 
| +++ b/chrome/browser/media_gallery/media_file_system_registry.h | 
| @@ -19,8 +19,8 @@ | 
| #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/system_monitor/system_monitor.h" | 
| -#include "content/public/browser/notification_observer.h" | 
| #include "webkit/fileapi/media/mtp_device_file_system_config.h" | 
|  | 
| class Profile; | 
| @@ -81,7 +81,7 @@ typedef base::Callback<void(const std::vector<MediaFileSystemInfo>&)> | 
|  | 
| class MediaFileSystemRegistry | 
| : public base::SystemMonitor::DevicesChangedObserver, | 
| -      public content::NotificationObserver { | 
| +      public PrefObserver { | 
| public: | 
| // The instance is lazily created per browser process. | 
| static MediaFileSystemRegistry* GetInstance(); | 
| @@ -131,10 +131,9 @@ class MediaFileSystemRegistry | 
| MediaFileSystemRegistry(); | 
| virtual ~MediaFileSystemRegistry(); | 
|  | 
| -  // NotificationObserver implementation. | 
| -  virtual void Observe(int type, | 
| -                       const content::NotificationSource& source, | 
| -                       const content::NotificationDetails& details) OVERRIDE; | 
| +  // PrefObserver implementation. | 
| +  virtual void OnPreferenceChanged(PrefServiceBase* service, | 
| +                                   const std::string& pref_name) OVERRIDE; | 
|  | 
| #if defined(SUPPORT_MTP_DEVICE_FILESYSTEM) | 
| // Returns ScopedMtpDeviceMapEntry object for the given |device_location|. | 
|  |