Remove #pragma once from ash

ash/wm/window_cycle_list.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_WINDOW_CYCLE_LIST_H_
 #define ASH_WM_WINDOW_CYCLE_LIST_H_
-#pragma once
 
 #include <vector>
 
 #include "ash/ash_export.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/window_observer.h"
 
 namespace ash {
 
@@ skipping 33 matching lines @@
 
   // Current position in the |windows_| list or -1 if we're not cycling.
   int current_index_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowCycleList);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_CYCLE_LIST_H_