Update modules classes to use OVERRIDE / FINAL when needed

Source/modules/webaudio/OfflineAudioCompletionEvent.h

 /*
  * Copyright (C) 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 
 #include "core/events/Event.h"
 #include "modules/webaudio/AudioBuffer.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace WebCore {
 
 class AudioBuffer;
 
-class OfflineAudioCompletionEvent : public Event {
+class OfflineAudioCompletionEvent FINAL : public Event {
 public:
     static PassRefPtr<OfflineAudioCompletionEvent> create();
     static PassRefPtr<OfflineAudioCompletionEvent> create(PassRefPtr<AudioBuffer> renderedBuffer);
 
     virtual ~OfflineAudioCompletionEvent();
 
     AudioBuffer* renderedBuffer() { return m_renderedBuffer.get(); }
 
-    virtual const AtomicString& interfaceName() const;
+    virtual const AtomicString& interfaceName() const OVERRIDE;
 
 private:
     OfflineAudioCompletionEvent();
     explicit OfflineAudioCompletionEvent(PassRefPtr<AudioBuffer> renderedBuffer);
 
     RefPtr<AudioBuffer> m_renderedBuffer;
 };
 
 } // namespace WebCore
 
 #endif // OfflineAudioCompletionEvent_h