Make PrefService available in *ash

ash/shell_delegate.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 ASH_SHELL_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
 #include "ash/ash_export.h"
 #include "base/callback.h"
 #include "base/strings/string16.h"
 
 class GURL;
+class PrefService;
 
 namespace gfx {
 class Image;
 }
 
 namespace keyboard {
 class KeyboardUI;
 }
 
 namespace service_manager {
@@ skipping 88 matching lines @@
   // Creates a GPU support object. Shell takes ownership of the object.
   virtual GPUSupport* CreateGPUSupport() = 0;
 
   // Get the product name.
   virtual base::string16 GetProductName() const = 0;
 
   virtual void OpenKeyboardShortcutHelpPage() const {}
 
   virtual gfx::Image GetDeprecatedAcceleratorImage() const = 0;
 
+  virtual PrefService* GetActiveUserPrefService() const = 0;
+
   // If |use_local_state| is true, returns the touchscreen status from local
   // state, otherwise from user prefs.
   virtual bool IsTouchscreenEnabledInPrefs(bool use_local_state) const = 0;
 
   // Sets the status of touchscreen to |enabled| in prefs. If |use_local_state|,
   // pref is set in local state, otherwise in user prefs.
   virtual void SetTouchscreenEnabledInPrefs(bool enabled,
                                             bool use_local_state) = 0;
 
   // Updates the enabled/disabled status of the touchscreen from prefs. Enabled
   // if both local state and user prefs are enabled, otherwise disabled.
   virtual void UpdateTouchscreenStatusFromPrefs() = 0;
 
   // Toggles the status of touchpad between enabled and disabled.
   virtual void ToggleTouchpad() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_