Make ThreadableLoader class to use references

Source/core/workers/Worker.cpp

 /*
  * Copyright (C) 2008, 2010 Apple Inc. All Rights Reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 56 matching lines @@
     worker->suspendIfNeeded();
 
     KURL scriptURL = worker->resolveURL(url, exceptionState);
     if (scriptURL.isEmpty())
         return nullptr;
 
     // The worker context does not exist while loading, so we must ensure that the worker object is not collected, nor are its event listeners.
     worker->setPendingActivity(worker.get());
 
     worker->m_scriptLoader = WorkerScriptLoader::create();
-    worker->m_scriptLoader->loadAsynchronously(context, scriptURL, DenyCrossOriginRequests, worker.get());
+    worker->m_scriptLoader->loadAsynchronously(*context, scriptURL, DenyCrossOriginRequests, worker.get());
     worker->m_contextProxy = proxyProvider->createWorkerGlobalScopeProxy(worker.get());
     return worker.release();
 }
 
 Worker::~Worker()
 {
     ASSERT(isMainThread());
     ASSERT(executionContext()); // The context is protected by worker context proxy, so it cannot be destroyed while a Worker exists.
     if (m_contextProxy)
         m_contextProxy->workerObjectDestroyed();
@@ skipping 49 matching lines @@
 
     unsetPendingActivity(this);
 }
 
 void Worker::trace(Visitor* visitor)
 {
     AbstractWorker::trace(visitor);
 }
 
 } // namespace WebCore