Fix virtual/override/final usage in the rest of Source/core/.

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 30 matching lines @@
 
 #if ENABLE(OILPAN)
 #define DOMWINDOWEVENTQUEUE_BASE_CLASSES public EventQueue
 #else
 #define DOMWINDOWEVENTQUEUE_BASE_CLASSES public RefCounted<DOMWindowEventQueue>, public EventQueue
 #endif
 
 class DOMWindowEventQueue final : DOMWINDOWEVENTQUEUE_BASE_CLASSES {
 public:
     static PassRefPtrWillBeRawPtr<DOMWindowEventQueue> create(ExecutionContext*);
-    virtual ~DOMWindowEventQueue();
+    ~DOMWindowEventQueue() override;
 
     // EventQueue
     DECLARE_VIRTUAL_TRACE();
-    virtual bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) override;
-    virtual bool cancelEvent(Event*) override;
-    virtual void close() override;
+    bool enqueueEvent(PassRefPtrWillBeRawPtr<Event>) override;
+    bool cancelEvent(Event*) override;
+    void close() override;
 
 private:
     explicit DOMWindowEventQueue(ExecutionContext*);
 
     void pendingEventTimerFired();
     void dispatchEvent(PassRefPtrWillBeRawPtr<Event>);
 
     OwnPtrWillBeMember<DOMWindowEventQueueTimer> m_pendingEventTimer;
     WillBeHeapListHashSet<RefPtrWillBeMember<Event>, 16> m_queuedEvents;
     bool m_isClosed;
 
     friend class DOMWindowEventQueueTimer;
 };
 
 }
 
 #endif // DOMWindowEventQueue_h