Remove #pragma once from ash

ash/wm/workspace/multi_window_resize_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_WM_WORKSPACE_MULTI_WINDOW_RESIZE_CONTROLLER_H_
 #define ASH_WM_WORKSPACE_MULTI_WINDOW_RESIZE_CONTROLLER_H_
-#pragma once
 
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/mouse_watcher.h"
@@ skipping 156 matching lines @@
   // to Show().
   scoped_ptr<views::MouseWatcher> mouse_watcher_;
 
   DISALLOW_COPY_AND_ASSIGN(MultiWindowResizeController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_MULTI_WINDOW_RESIZE_CONTROLLER_H_