Update AbstractWorker, Worker and SharedWorker to match the spec

Source/core/workers/SharedWorker.cpp

 /*
  * 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 28 matching lines @@
 #include "core/dom/ScriptExecutionContext.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/page/UseCounter.h"
 #include "core/workers/SharedWorkerRepository.h"
 #include "weborigin/KURL.h"
 #include "weborigin/SecurityOrigin.h"
 
 namespace WebCore {
 
 inline SharedWorker::SharedWorker(ScriptExecutionContext* context)
-    : AbstractWorker(context)
+    : ActiveDOMObject(context)
 {
     ScriptWrappable::init(this);
 }
 
 PassRefPtr<SharedWorker> SharedWorker::create(ScriptExecutionContext* context, const String& url, const String& name, ExceptionCode& ec)
 {
     ASSERT(isMainThread());
     UseCounter::count(static_cast<Document*>(context)->domWindow(), UseCounter::SharedWorkerStart);
 
     RefPtr<SharedWorker> worker = adoptRef(new SharedWorker(context));
@@ skipping 24 matching lines @@
 
 SharedWorker::~SharedWorker()
 {
 }
 
 const AtomicString& SharedWorker::interfaceName() const
 {
     return eventNames().interfaceForSharedWorker;
 }
 
+void SharedWorker::contextDestroyed()
+{
+    ActiveDOMObject::contextDestroyed();
+}
+
 } // namespace WebCore