Make ThreadableLoader class to use references

Source/core/workers/WorkerScriptLoader.h

 /*
  * Copyright (C) 2009 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009, 2011 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 35 matching lines @@
     class WorkerScriptLoaderClient;
 
     class WorkerScriptLoader FINAL : public RefCounted<WorkerScriptLoader>, public ThreadableLoaderClient {
         WTF_MAKE_FAST_ALLOCATED;
     public:
         static PassRefPtr<WorkerScriptLoader> create()
         {
             return adoptRef(new WorkerScriptLoader());
         }
 
-        void loadSynchronously(ExecutionContext*, const KURL&, CrossOriginRequestPolicy);
-        void loadAsynchronously(ExecutionContext*, const KURL&, CrossOriginRequestPolicy, WorkerScriptLoaderClient*);
+        void loadSynchronously(ExecutionContext&, const KURL&, CrossOriginRequestPolicy);
+        void loadAsynchronously(ExecutionContext&, const KURL&, CrossOriginRequestPolicy, WorkerScriptLoaderClient*);
 
         void notifyError();
 
         // This will immediately lead to notifyFinished() if loadAsynchronously
         // is in progress.
         void cancel();
 
         void setClient(WorkerScriptLoaderClient* client) { m_client = client; }
 
         String script();
@@ skipping 28 matching lines @@
         KURL m_responseURL;
         bool m_failed;
         unsigned long m_identifier;
         bool m_finishing;
         ResourceRequest::TargetType m_targetType;
     };
 
 } // namespace WebCore
 
 #endif // WorkerScriptLoader_h