Update worker classes to use OVERRIDE / FINAL when needed

Source/core/workers/Worker.h

 /*
  * Copyright (C) 2008, 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 28 matching lines @@
 #include "wtf/RefPtr.h"
 #include "wtf/text/AtomicStringHash.h"
 
 namespace WebCore {
 
 class ExceptionState;
 class ExecutionContext;
 class WorkerGlobalScopeProxy;
 class WorkerScriptLoader;
 
-class Worker : public AbstractWorker, public ScriptWrappable, private WorkerScriptLoaderClient {
+class Worker FINAL : public AbstractWorker, public ScriptWrappable, private WorkerScriptLoaderClient {
 public:
     static PassRefPtr<Worker> create(ExecutionContext*, const String& url, ExceptionState&);
     virtual ~Worker();
 
     virtual const AtomicString& interfaceName() const OVERRIDE;
 
     void postMessage(PassRefPtr<SerializedScriptValue> message, const MessagePortArray*, ExceptionState&);
 
     void terminate();
 
     virtual void stop() OVERRIDE;
     virtual bool hasPendingActivity() const OVERRIDE;
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(message);
 
 private:
     explicit Worker(ExecutionContext*);
 
     // WorkerScriptLoaderClient callbacks
     virtual void didReceiveResponse(unsigned long identifier, const ResourceResponse&) OVERRIDE;
     virtual void notifyFinished() OVERRIDE;
 
     RefPtr<WorkerScriptLoader> m_scriptLoader;
     WorkerGlobalScopeProxy* m_contextProxy; // The proxy outlives the worker to perform thread shutdown.
 };
 
 } // namespace WebCore
 
 #endif // Worker_h