Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/web_resource/promo_resource_service.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_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
 #define CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_
 
 #include <string>
 
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/web_resource/web_resource_service.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 class NotificationPromo;
 class PrefRegistrySimple;
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
+class PrefService;
 
 // A PromoResourceService fetches data from a web resource server to be used to
 // dynamically change the appearance of the New Tab Page. For example, it has
 // been used to fetch "tips" to be displayed on the NTP, or to display
 // promotional messages to certain groups of Chrome users.
 class PromoResourceService : public WebResourceService {
  public:
   static void RegisterPrefs(PrefRegistrySimple* registry);
-  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
+  static void RegisterUserPrefs(PrefService* prefs,
+                                PrefRegistrySyncable* registry);
 
   PromoResourceService();
 
  private:
   virtual ~PromoResourceService();
 
   // Schedule a notification that a web resource is either going to become
   // available or be no longer valid.
   void ScheduleNotification(const NotificationPromo& notification_promo);
 
@@ skipping 16 matching lines @@
 
   // Allows the creation of tasks to send a notification.
   // This allows the PromoResourceService to notify the New Tab Page immediately
   // when a new web resource should be shown or removed.
   base::WeakPtrFactory<PromoResourceService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PromoResourceService);
 };
 
 #endif  // CHROME_BROWSER_WEB_RESOURCE_PROMO_RESOURCE_SERVICE_H_