Remove #pragma once from content

content/common/fileapi/webblobregistry_impl.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_COMMON_FILEAPI_WEBBLOBREGISTRY_IMPL_H_
 #define CONTENT_COMMON_FILEAPI_WEBBLOBREGISTRY_IMPL_H_
-#pragma once
 
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebBlobRegistry.h"
 
 class ChildThread;
 
 namespace WebKit {
 class WebBlobData;
 class WebURL;
 }
 
 class WebBlobRegistryImpl : public WebKit::WebBlobRegistry {
  public:
   explicit WebBlobRegistryImpl(ChildThread* child_thread);
   virtual ~WebBlobRegistryImpl();
 
   // See WebBlobRegistry.h for documentation on these functions.
   virtual void registerBlobURL(const WebKit::WebURL& url,
                                WebKit::WebBlobData& data);
   virtual void registerBlobURL(const WebKit::WebURL& url,
                                const WebKit::WebURL& src_url);
   virtual void unregisterBlobURL(const WebKit::WebURL& url);
 
  private:
   ChildThread* child_thread_;
 };
 
 #endif  // CONTENT_COMMON_FILEAPI_WEBBLOBREGISTRY_IMPL_H_