Remove #pragma once from content

content/browser/renderer_host/backing_store_manager.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 CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_
-#pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback_forward.h"
 #include "base/process.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 #include "ui/surface/transport_dib.h"
 
@@ skipping 60 matching lines @@
   static size_t MemorySize();
 
  private:
   // Not intended for instantiation.
   BackingStoreManager() {}
 
   DISALLOW_COPY_AND_ASSIGN(BackingStoreManager);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MANAGER_H_