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

Source/core/events/TransitionEvent.h

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. 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
@@ skipping 30 matching lines @@
     }
     static PassRefPtrWillBeRawPtr<TransitionEvent> create(const AtomicString& type, const String& propertyName, double elapsedTime, const String& pseudoElement)
     {
         return adoptRefWillBeNoop(new TransitionEvent(type, propertyName, elapsedTime, pseudoElement));
     }
     static PassRefPtrWillBeRawPtr<TransitionEvent> create(const AtomicString& type, const TransitionEventInit& initializer)
     {
         return adoptRefWillBeNoop(new TransitionEvent(type, initializer));
     }
 
-    virtual ~TransitionEvent();
+    ~TransitionEvent() override;
 
     const String& propertyName() const;
     double elapsedTime() const;
     const String& pseudoElement() const;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     TransitionEvent();
     TransitionEvent(const AtomicString& type, const String& propertyName, double elapsedTime, const String& pseudoElement);
     TransitionEvent(const AtomicString& type, const TransitionEventInit& initializer);
 
     String m_propertyName;
     double m_elapsedTime;
     String m_pseudoElement;
 };
 
 } // namespace blink
 
 #endif // TransitionEvent_h