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

Source/core/events/AnimationEvent.h

 /*
  * Copyright (C) 2007, 2008 Apple 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 29 matching lines @@
     }
     static PassRefPtrWillBeRawPtr<AnimationEvent> create(const AtomicString& type, const String& animationName, double elapsedTime)
     {
         return adoptRefWillBeNoop(new AnimationEvent(type, animationName, elapsedTime));
     }
     static PassRefPtrWillBeRawPtr<AnimationEvent> create(const AtomicString& type, const AnimationEventInit& initializer)
     {
         return adoptRefWillBeNoop(new AnimationEvent(type, initializer));
     }
 
-    virtual ~AnimationEvent();
+    ~AnimationEvent() override;
 
     const String& animationName() const;
     double elapsedTime() const;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     AnimationEvent();
     AnimationEvent(const AtomicString& type, const String& animationName, double elapsedTime);
     AnimationEvent(const AtomicString&, const AnimationEventInit&);
 
     String m_animationName;
     double m_elapsedTime;
 };
 
 } // namespace blink
 
 #endif // AnimationEvent_h