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

Source/core/events/AnimationPlayerEvent.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef AnimationPlayerEvent_h
 #define AnimationPlayerEvent_h
 
 #include "core/events/AnimationPlayerEventInit.h"
 #include "core/events/Event.h"
 
 namespace blink {
 
 class AnimationPlayerEvent final : public Event {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<AnimationPlayerEvent> create()
     {
         return adoptRefWillBeNoop(new AnimationPlayerEvent);
     }
     static PassRefPtrWillBeRawPtr<AnimationPlayerEvent> create(const AtomicString& type, double currentTime, double timelineTime)
     {
         return adoptRefWillBeNoop(new AnimationPlayerEvent(type, currentTime, timelineTime));
     }
     static PassRefPtrWillBeRawPtr<AnimationPlayerEvent> create(const AtomicString& type, const AnimationPlayerEventInit& initializer)
     {
         return adoptRefWillBeNoop(new AnimationPlayerEvent(type, initializer));
     }
 
-    virtual ~AnimationPlayerEvent();
+    ~AnimationPlayerEvent() override;
 
     double currentTime() const;
     double timelineTime() const;
 
-    virtual const AtomicString& interfaceName() const override;
+    const AtomicString& interfaceName() const override;
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     AnimationPlayerEvent();
     AnimationPlayerEvent(const AtomicString& type, double currentTime, double timelineTime);
     AnimationPlayerEvent(const AtomicString&, const AnimationPlayerEventInit&);
 
     double m_currentTime;
     double m_timelineTime;
 };
 
 } // namespace blink
 
 #endif // AnimationPlayerEvent_h