Remove #pragma once from ash

ash/wm/default_window_resizer.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_DEFAULT_WINDOW_RESIZER_H_
 #define ASH_WM_DEFAULT_WINDOW_RESIZER_H_
-#pragma once
 
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 
 namespace ash {
 
 // WindowResizer is used by ToplevelWindowEventFilter to handle dragging, moving
 // or resizing a window. All coordinates passed to this are in the parent
 // windows coordiantes.
 class ASH_EXPORT DefaultWindowResizer : public WindowResizer {
@@ skipping 26 matching lines @@
 
   // Set to true once Drag() is invoked and the bounds of the window change.
   bool did_move_or_resize_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultWindowResizer);
 };
 
 }  // namespace aura
 
 #endif  // ASH_WM_DEFAULT_WINDOW_RESIZER_H_