Update Event classes to use OVERRIDE / FINAL when needed

Source/core/events/DOMWindowEventQueue.h

 /*
  * Copyright (C) 2010 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 23 matching lines @@
 #include "wtf/OwnPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class Event;
 class DOMWindowEventQueueTimer;
 class Node;
 class ExecutionContext;
 
-class DOMWindowEventQueue : public RefCounted<DOMWindowEventQueue>, public EventQueue {
+class DOMWindowEventQueue FINAL : public RefCounted<DOMWindowEventQueue>, public EventQueue {
 public:
     static PassRefPtr<DOMWindowEventQueue> create(ExecutionContext*);
     virtual ~DOMWindowEventQueue();
 
     // EventQueue
     virtual bool enqueueEvent(PassRefPtr<Event>) OVERRIDE;
     virtual bool cancelEvent(Event*) OVERRIDE;
     virtual void close() OVERRIDE;
 
 private:
     explicit DOMWindowEventQueue(ExecutionContext*);
 
     void pendingEventTimerFired();
     void dispatchEvent(PassRefPtr<Event>);
 
     OwnPtr<DOMWindowEventQueueTimer> m_pendingEventTimer;
     ListHashSet<RefPtr<Event>, 16> m_queuedEvents;
     bool m_isClosed;
 
     friend class DOMWindowEventQueueTimer;
 };
 
 }
 
 #endif // DOMWindowEventQueue_h