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

Source/core/events/GenericEventQueue.h

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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 22 matching lines @@
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
 class CORE_EXPORT GenericEventQueue final : public EventQueue {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(GenericEventQueue);
 public:
     static PassOwnPtrWillBeRawPtr<GenericEventQueue> create(EventTarget*);
-    virtual ~GenericEventQueue();
+    ~GenericEventQueue() 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;
 
     void cancelAllEvents();
     bool hasPendingEvents() const;
 
 private:
     explicit GenericEventQueue(EventTarget*);
     void timerFired(Timer<GenericEventQueue>*);
 
     RawPtrWillBeMember<EventTarget> m_owner;
     WillBeHeapVector<RefPtrWillBeMember<Event>> m_pendingEvents;
     Timer<GenericEventQueue> m_timer;
 
     bool m_isClosed;
 };
 
 }
 
 #endif