Update worker classes to use OVERRIDE / FINAL when needed

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 27 matching lines @@
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
     class ResourceRequest;
     class ResourceResponse;
     class ExecutionContext;
     class TextResourceDecoder;
     class WorkerScriptLoaderClient;
 
-    class WorkerScriptLoader : public RefCounted<WorkerScriptLoader>, public ThreadableLoaderClient {
+    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*);
 
@@ skipping 16 matching lines @@
         virtual void didFinishLoading(unsigned long identifier, double) OVERRIDE;
         virtual void didFail(const ResourceError&) OVERRIDE;
         virtual void didFailRedirectCheck() OVERRIDE;
 
         void setTargetType(ResourceRequest::TargetType targetType) { m_targetType = targetType; }
 
     private:
         friend class WTF::RefCounted<WorkerScriptLoader>;
 
         WorkerScriptLoader();
-        ~WorkerScriptLoader();
+        virtual ~WorkerScriptLoader();
 
         PassOwnPtr<ResourceRequest> createResourceRequest();
         void notifyFinished();
 
         WorkerScriptLoaderClient* m_client;
         RefPtr<ThreadableLoader> m_threadableLoader;
         String m_responseEncoding;
         OwnPtr<TextResourceDecoder> m_decoder;
         StringBuilder m_script;
         KURL m_url;
         KURL m_responseURL;
         bool m_failed;
         unsigned long m_identifier;
         bool m_finishing;
         ResourceRequest::TargetType m_targetType;
     };
 
 } // namespace WebCore
 
 #endif // WorkerScriptLoader_h