Expose WebServiceWorkerNetworkProvider on DataSource

third_party/WebKit/Source/platform/exported/WebURLResponse.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 351 matching lines @@
 }
 
 WebURLResponse::ExtraData* WebURLResponse::getExtraData() const {
   RefPtr<ResourceResponse::ExtraData> data = m_resourceResponse->getExtraData();
   if (!data)
     return 0;
   return static_cast<ExtraDataContainer*>(data.get())->getExtraData();
 }
 
 void WebURLResponse::setExtraData(WebURLResponse::ExtraData* extraData) {
-  m_resourceResponse->setExtraData(ExtraDataContainer::create(extraData));
+  if (extraData != getExtraData())
+    m_resourceResponse->setExtraData(ExtraDataContainer::create(extraData));
 }
 
 void WebURLResponse::appendRedirectResponse(const WebURLResponse& response) {
   m_resourceResponse->appendRedirectResponse(response.toResourceResponse());
 }
 
 WebURLResponse::WebURLResponse(ResourceResponse& r) : m_resourceResponse(&r) {}
 
 }  // namespace blink