Update Event classes to use OVERRIDE / FINAL when needed

Source/core/events/CustomEvent.h

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 @@
 #define CustomEvent_h
 
 #include "core/events/Event.h"
 
 namespace WebCore {
 
 class SerializedScriptValue;
 
 typedef EventInit CustomEventInit;
 
-class CustomEvent : public Event {
+class CustomEvent FINAL : public Event {
 public:
     virtual ~CustomEvent();
 
     static PassRefPtr<CustomEvent> create()
     {
         return adoptRef(new CustomEvent);
     }
 
     static PassRefPtr<CustomEvent> create(const AtomicString& type, const CustomEventInit& initializer)
     {
         return adoptRef(new CustomEvent(type, initializer));
     }
 
     void initCustomEvent(const AtomicString& type, bool canBubble, bool cancelable, PassRefPtr<SerializedScriptValue>);
 
-    virtual const AtomicString& interfaceName() const;
+    virtual const AtomicString& interfaceName() const OVERRIDE;
 
     SerializedScriptValue* serializedDetail() { return m_serializedDetail.get(); }
 
     void setSerializedDetail(PassRefPtr<SerializedScriptValue> detail)
     {
         ASSERT(!m_serializedDetail);
         m_serializedDetail = detail;
     }
 
 private:
     CustomEvent();
     CustomEvent(const AtomicString& type, const CustomEventInit& initializer);
 
     RefPtr<SerializedScriptValue> m_serializedDetail;
 };
 
 } // namespace WebCore
 
 #endif // CustomEvent_h