Update animation classes to use OVERRIDE / FINAL when needed

Source/core/animation/DocumentTimeline.h

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 94 matching lines @@
         }
         RefPtr<EventTarget> target;
         RefPtr<Event> event;
     };
     Vector<EventToDispatch> m_events;
 
     static const double s_minimumDelay;
 
     OwnPtr<PlatformTiming> m_timing;
 
-    class DocumentTimelineTiming : public PlatformTiming {
+    class DocumentTimelineTiming FINAL : public PlatformTiming {
     public:
         DocumentTimelineTiming(DocumentTimeline* documentTimeline)
             : m_timeline(documentTimeline)
             , m_timer(this, &DocumentTimelineTiming::timerFired)
         {
             ASSERT(m_timeline);
         }
 
         virtual void wakeAfter(double duration) OVERRIDE;
         virtual void cancelWake() OVERRIDE;
         virtual void serviceOnNextFrame() OVERRIDE;
 
         void timerFired(Timer<DocumentTimelineTiming>*) { m_timeline->wake(); }
 
     private:
         DocumentTimeline* m_timeline;
         Timer<DocumentTimelineTiming> m_timer;
 
     };
 
     friend class AnimationDocumentTimelineTest;
 };
 
 } // namespace
 
 #endif