Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/media/media_capture_devices_dispatcher.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_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
 #define CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/singleton.h"
 #include "base/observer_list.h"
 #include "content/public/browser/media_observer.h"
 #include "content/public/common/media_stream_request.h"
 
 class MediaStreamCaptureIndicator;
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
+class PrefService;
 class Profile;
 
 // This singleton is used to receive updates about media events from the content
 // layer.
 class MediaCaptureDevicesDispatcher : public content::MediaObserver {
  public:
   class Observer {
    public:
     // Handle an information update consisting of a up-to-date audio capture
     // device lists. This happens when a microphone is plugged in or unplugged.
@@ skipping 11 matching lines @@
         int render_view_id,
         const content::MediaStreamDevice& device,
         const content::MediaRequestState state) {}
 
     virtual ~Observer() {}
   };
 
   static MediaCaptureDevicesDispatcher* GetInstance();
 
   // Registers the preferences related to Media Stream default devices.
-  static void RegisterUserPrefs(PrefServiceSyncable* user_prefs);
+  static void RegisterUserPrefs(PrefService* user_prefs,
+                                PrefRegistrySyncable* registry);
 
   // Methods for observers. Called on UI thread.
   // Observers should add themselves on construction and remove themselves
   // on destruction.
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
   const content::MediaStreamDevices& GetAudioCaptureDevices();
   const content::MediaStreamDevices& GetVideoCaptureDevices();
 
   // Helper to get the default devices which can be used by the media request,
@@ skipping 60 matching lines @@
   ObserverList<Observer> observers_;
 
   // Flag to indicate if device enumeration has been done/doing.
   // Only accessed on UI thread.
   bool devices_enumerated_;
 
   scoped_refptr<MediaStreamCaptureIndicator> media_stream_capture_indicator_;
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_CAPTURE_DEVICES_DISPATCHER_H_