Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/media_gallery/media_galleries_preferences.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_MEDIA_GALLERY_MEDIA_GALLERIES_PREFERENCES_H_
 #define CHROME_BROWSER_MEDIA_GALLERY_MEDIA_GALLERIES_PREFERENCES_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/observer_list.h"
 #include "base/string16.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
 class Profile;
 
 namespace base {
 class DictionaryValue;
 }
 
 namespace extensions {
 class Extension;
 class ExtensionPrefs;
 }
@@ skipping 93 matching lines @@
                                         MediaGalleryPrefId pref_id,
                                         bool has_permission);
 
   const MediaGalleriesPrefInfoMap& known_galleries() const {
     return known_galleries_;
   }
 
   // ProfileKeyedService implementation:
   virtual void Shutdown() OVERRIDE;
 
-  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
+  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
   // Returns true if the media gallery preferences system has ever been used
   // for this profile. To be exact, it checks if a gallery has ever been added
   // (including defaults).
   static bool APIHasBeenUsed(Profile* profile);
 
  private:
   typedef std::map<std::string /*device id*/, MediaGalleryPrefIdSet>
       DeviceIdPrefIdsMap;
 
@@ skipping 20 matching lines @@
   DeviceIdPrefIdsMap device_map_;
 
   ObserverList<GalleryChangeObserver> gallery_change_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaGalleriesPreferences);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERY_MEDIA_GALLERIES_PREFERENCES_H_