Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/webui/ntp/new_tab_page_handler.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_UI_WEBUI_NTP_NEW_TAB_PAGE_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_PAGE_HANDLER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "base/values.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/web_ui_message_handler.h"
 
 class PrefRegistrySimple;
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
 class Profile;
 
 // Handler for general New Tab Page functionality that does not belong in a
 // more specialized handler.
 class NewTabPageHandler : public content::WebUIMessageHandler,
                           public base::SupportsWeakPtr<NewTabPageHandler> {
  public:
   NewTabPageHandler();
 
   // Register NTP per-profile preferences.
-  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
+  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
   // Registers values (strings etc.) for the page.
   static void GetLocalizedValues(Profile* profile, DictionaryValue* values);
 
  private:
   virtual ~NewTabPageHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
@@ skipping 50 matching lines @@
   static const int kHistogramEnumerationMax =
       (LAST_PAGE_ID >> kPageIdOffset) + 1;
 
   // Helper to send out promo resource change notification.
   void Notify(chrome::NotificationType notification_type);
 
   DISALLOW_COPY_AND_ASSIGN(NewTabPageHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NEW_TAB_PAGE_HANDLER_H_