Remove #pragma once from ash

ash/wm/partial_screenshot_view.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_WM_PARTIAL_SCREENSHOT_VIEW_H_
 #define ASH_WM_PARTIAL_SCREENSHOT_VIEW_H_
-#pragma once
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/point.h"
 #include "ui/views/widget/widget_delegate.h"
 
 namespace ash {
 class ScreenshotDelegate;
 
 // The view of taking partial screenshot, i.e.: drawing region
@@ skipping 28 matching lines @@
   gfx::Point start_position_;
   gfx::Point current_position_;
   ScreenshotDelegate* screenshot_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(PartialScreenshotView);
 };
 
 }  // namespace ash
 
 #endif  // #ifndef ASH_WM_PARTIAL_SCREENSHOT_VIEW_H_