Remove #pragma once from ash

ash/root_window_controller.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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 
 class SkBitmap;
 
 namespace aura {
 class EventFilter;
 class RootWindow;
 class Window;
@@ skipping 60 matching lines @@
   scoped_ptr<internal::ScreenDimmer> screen_dimmer_;
   scoped_ptr<internal::WorkspaceController> workspace_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 }  // namespace internal
 }  // ash
 
 #endif  //  ASH_ROOT_WINDOW_CONTROLLER_H_