Remove #pragma once from ash

ash/wm/workspace/snap_sizer.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_SNAP_SIZER_H_
 #define ASH_WM_WORKSPACE_SNAP_SIZER_H_
-#pragma once
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/time.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class Window;
 }
 
@@ skipping 69 matching lines @@
   // X-coordinate last supplied to Update().
   int last_update_x_;
 
   DISALLOW_COPY_AND_ASSIGN(SnapSizer);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_WM_WORKSPACE_SNAP_SIZER_H_