Remove #pragma once from content

content/browser/plugin_data_remover_impl.h

 // Copyright (c) 2011 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_PLUGIN_DATA_REMOVER_IMPL_H_
 #define CONTENT_BROWSER_PLUGIN_DATA_REMOVER_IMPL_H_
-#pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/time.h"
 #include "content/public/browser/plugin_data_remover.h"
 
 namespace content {
 
@@ skipping 21 matching lines @@
   // This allows this object to be deleted on the UI thread while it's still
   // being used on the IO thread.
   scoped_refptr<Context> context_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginDataRemoverImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_PLUGIN_DATA_REMOVER_IMPL_H_