Remove #pragma once from ash

ash/launcher/launcher_button.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_LAUNCHER_LAUNCHER_BUTTON_H_
 #define ASH_LAUNCHER_LAUNCHER_BUTTON_H_
-#pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/controls/button/custom_button.h"
 #include "ui/views/controls/image_view.h"
 
 namespace ash {
 namespace internal {
 
 class LauncherButtonHost;
 
@@ skipping 109 matching lines @@
   // has a STATE_PENDING bit and destroyed when that bit is clear.
   scoped_ptr<IconPulseAnimation> icon_pulse_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherButton);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_BUTTON_H_