Make WorkerScriptLoader back to RefCounted class

Source/web/WebEmbeddedWorkerImpl.cpp

 /*
  * Copyright (C) 2013 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 243 matching lines @@
 void WebEmbeddedWorkerImpl::didFinishDocumentLoad(WebLocalFrame* frame, bool)
 {
     ASSERT(!m_mainScriptLoader);
     ASSERT(!m_networkProvider);
     ASSERT(m_mainFrame);
     ASSERT(m_workerContextClient);
     ASSERT(m_loadingShadowPage);
     ASSERT(!m_askedToTerminate);
     m_loadingShadowPage = false;
     m_networkProvider = adoptPtr(m_workerContextClient->createServiceWorkerNetworkProvider(frame->dataSource()));
-    m_mainScriptLoader = adoptPtr(new WorkerScriptLoader());
+    m_mainScriptLoader = WorkerScriptLoader::create();
     m_mainScriptLoader->setRequestContext(WebURLRequest::RequestContextServiceWorker);
     m_mainScriptLoader->loadAsynchronously(
         *m_mainFrame->frame()->document(),
         m_workerStartData.scriptURL,
         DenyCrossOriginRequests,
         nullptr,
         bind(&WebEmbeddedWorkerImpl::onScriptLoaderFinished, this));
     // Do nothing here since onScriptLoaderFinished() might have been already
     // invoked and |this| might have been deleted at this point.
 }
@@ skipping 70 matching lines @@
     m_mainScriptLoader.clear();
 
     m_workerGlobalScopeProxy = ServiceWorkerGlobalScopeProxy::create(*this, *document, *m_workerContextClient);
     m_loaderProxy = WorkerLoaderProxy::create(this);
     m_workerThread = ServiceWorkerThread::create(m_loaderProxy, *m_workerGlobalScopeProxy);
     m_workerThread->start(startupData.release());
     m_workerInspectorProxy->workerThreadCreated(document, m_workerThread.get(), scriptURL);
 }
 
 } // namespace blink