Update AbstractWorker, Worker and SharedWorker to match the spec

Source/core/workers/SharedWorker.h

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2010 Apple 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.
@@ skipping 18 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef SharedWorker_h
 #define SharedWorker_h
 
 #include "core/workers/AbstractWorker.h"
 
 namespace WebCore {
 
-    class SharedWorker : public AbstractWorker {
+    class SharedWorker : public AbstractWorker, public ScriptWrappable {
     public:
         static PassRefPtr<SharedWorker> create(ScriptExecutionContext*, const String& url, const String& name, ExceptionCode&);
         virtual ~SharedWorker();
 
         MessagePort* port() const { return m_port.get(); }
 
         virtual const AtomicString& interfaceName() const OVERRIDE;
 
     private:
         explicit SharedWorker(ScriptExecutionContext*);
 
         RefPtr<MessagePort> m_port;
     };
 
 } // namespace WebCore
 
 #endif // SharedWorker_h