Remove #pragma once from ash

ash/launcher/launcher_context_menu.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_LAUNCHER_LAUNCHER_CONTEXT_MENU_H_
 #define ASH_WM_LAUNCHER_LAUNCHER_CONTEXT_MENU_H_
-#pragma once
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher_alignment_menu.h"
 #include "ash/wm/shelf_types.h"
 #include "base/basictypes.h"
 #include "ui/base/models/simple_menu_model.h"
 
 namespace ash {
 
 // Context menu for the launcher.
@@ skipping 27 matching lines @@
   };
 
   LauncherAlignmentMenu alignment_menu_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherContextMenu);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_LAUNCHER_LAUNCHER_CONTEXT_MENU_H_