Remove #pragma once from ash

ash/magnifier/magnification_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_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_
 #define ASH_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/event_filter.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 
 namespace aura {
 class RootWindow;
@@ skipping 30 matching lines @@
   virtual void EnsurePointIsVisible(const gfx::Point& point, bool animate) = 0;
 
  protected:
   MagnificationController() {}
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_MAGNIFIER_MAGNIFICATION_CONTROLLER_H_