Remove #pragma once from ash

ash/touch/touch_uma.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_TOUCH_TOUCH_OBSERVER_UMA_H_
 #define ASH_TOUCH_TOUCH_OBSERVER_UMA_H_
-#pragma once
 
 #include <map>
 
 #include "ash/shell.h"
 #include "ui/aura/event_filter.h"
 #include "ui/gfx/point.h"
 #include "ui/views/widget/widget.h"
 
 namespace aura {
 class GestureEvent;
@@ skipping 19 matching lines @@
  private:
   std::map<ui::EventType, int> ui_event_type_map_;
 
   DISALLOW_COPY_AND_ASSIGN(TouchUMA);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_TOUCH_TOUCH_OBSERVER_UMA_H_