Remove #pragma once from ash

ash/launcher/background_animator.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_BACKGROUND_ANIMATOR_H_
 #define ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_
-#pragma once
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "ui/base/animation/animation_delegate.h"
 #include "ui/base/animation/slide_animation.h"
 
 namespace ash {
 namespace internal {
 
 // Delegate is notified any time the background changes.
@@ skipping 45 matching lines @@
   // Current alpha value of the background.
   int alpha_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundAnimator);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_BACKGROUND_ANIMATOR_H_