Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/media/media_stream_devices_controller.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_STREAM_DEVICES_CONTROLLER_H_
 #define CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_CONTROLLER_H_
 
 #include <string>
 
 #include "content/public/browser/web_contents_delegate.h"
 
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
 class Profile;
 class TabSpecificContentSettings;
 
 class MediaStreamDevicesController {
  public:
   MediaStreamDevicesController(Profile* profile,
                                TabSpecificContentSettings* content_settings,
                                const content::MediaStreamRequest& request,
                                const content::MediaResponseCallback& callback);
 
   virtual ~MediaStreamDevicesController();
 
   // Registers the prefs backing the audio and video policies.
-  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
+  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
   // Public method to be called before creating the MediaStreamInfoBarDelegate.
   // This function will check the content settings exceptions and take the
   // corresponding action on exception which matches the request.
   bool DismissInfoBarAndTakeActionOnSettings();
 
   // Public methods to be called by MediaStreamInfoBarDelegate;
   bool has_audio() const { return microphone_requested_; }
   bool has_video() const { return webcam_requested_; }
   const std::string& GetSecurityOriginSpec() const;
@@ skipping 54 matching lines @@
   // audio/video devices was granted or not.
   content::MediaResponseCallback callback_;
 
   bool microphone_requested_;
   bool webcam_requested_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDevicesController);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MEDIA_STREAM_DEVICES_CONTROLLER_H_