Split PrefService into PrefService, PrefServiceSimple and PrefServiceSyncable.

chrome/browser/chromeos/display/display_preferences.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_CHROMEOS_DISPLAY_DISPLAY_PREFERENCES_H_
 #define CHROME_BROWSER_CHROMEOS_DISPLAY_DISPLAY_PREFERENCES_H_
 
 #include "base/basictypes.h"
 
-class PrefService;
+class PrefServiceSimple;
+
 namespace gfx {
 class Display;
 class Insets;
 }
 
 namespace chromeos {
 
 // Registers the prefs associated with display settings and stored
 // into Local State.
-void RegisterDisplayLocalStatePrefs(PrefService* local_state);
+void RegisterDisplayLocalStatePrefs(PrefServiceSimple* local_state);
 
 // Sets or updates the display layout data to the specified |display| and
 // |pref_service|.
 void SetDisplayLayoutPref(const gfx::Display& display,
                           int layout,
                           int offset);
 
 // Stores the specified ID as the primary display ID to Local State.  Clears
 // the data if the internal display's ID is specified.
 void StorePrimaryDisplayIDPref(int64 display_id);
 
 // Sets or updates the primary display device by its ID, and notifies the update
 // to the system.
 void SetPrimaryDisplayIDPref(int64 display_id);
 
 // Sets or updates the overscan preference for the specified |display| to Local
 // State.
 void SetDisplayOverscan(const gfx::Display& display, const gfx::Insets& insets);
 
 // Checks the current display settings in Local State and notifies them to the
 // system.
 void NotifyDisplayLocalStatePrefChanged();
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_DISPLAY_DISPLAY_PREFERENCES_H_