Remove #pragma once from ash

ash/system/status_area_widget_delegate.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_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
 #define ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_
-#pragma once
 
 #include "ash/ash_export.h"
 #include "ash/wm/shelf_types.h"
 #include "ui/gfx/image/image_skia.h"
 #include "ui/views/accessible_pane_view.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace ash {
 namespace internal {
 
@@ skipping 36 matching lines @@
   const FocusCycler* focus_cycler_for_testing_;
   ShelfAlignment alignment_;
 
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegate);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_STATUS_AREA_WIDGET_DELEGATE_H_