Introduce PrefRegistrySyncable, simplifying PrefServiceSyncable.

chrome/browser/ui/webui/sync_promo/sync_promo_ui.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_SYNC_PROMO_SYNC_PROMO_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_SYNC_PROMO_SYNC_PROMO_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 
 class Profile;
-class PrefServiceSyncable;
+class PrefRegistrySyncable;
 
 // The Web UI handler for chrome://signin.
 class SyncPromoUI : public content::WebUIController {
  public:
   // Please keep this in sync with enums in sync_promo_trial.cc.
   enum Source {
     SOURCE_START_PAGE = 0, // This must be first.
     SOURCE_NTP_LINK,
     SOURCE_MENU,
     SOURCE_SETTINGS,
@@ skipping 20 matching lines @@
   // Returns true if a user has seen the sync promo at startup previously.
   static bool HasShownPromoAtStartup(Profile* profile);
 
   // Returns true if the user has previously skipped the sync promo.
   static bool HasUserSkippedSyncPromo(Profile* profile);
 
   // Registers the fact that the user has skipped the sync promo.
   static void SetUserSkippedSyncPromo(Profile* profile);
 
   // Registers the preferences the Sync Promo UI needs.
-  static void RegisterUserPrefs(PrefServiceSyncable* prefs);
+  static void RegisterUserPrefs(PrefRegistrySyncable* registry);
 
   // Returns the sync promo URL wth the given arguments in the query.
   // |next_page| is the URL to navigate to when the user completes or skips the
   // promo. If an empty URL is given then the promo will navigate to the NTP.
   // |source| identifies from where the sync promo is being called, and is used
   // to record sync promo UMA stats in the context of the source.
   // |auto_close| whether to close the sync promo automatically when done.
   static GURL GetSyncPromoURL(
       const GURL& next_page, Source source, bool auto_close);
 
@@ skipping 13 matching lines @@
   static bool UseWebBasedSigninFlow();
 
   // Forces UseWebBasedSigninFlow() to return true when set; used in tests only.
   static void ForceWebBasedSigninFlowForTesting(bool force);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncPromoUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SYNC_PROMO_SYNC_PROMO_UI_H_