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

Source/core/events/AnimationPlayerEvent.h

Index: Source/core/events/AnimationPlayerEvent.h
diff --git a/Source/core/events/AnimationPlayerEvent.h b/Source/core/events/AnimationPlayerEvent.h
index 8aa606082a09ca9de2fb2eeb8f7f6fc7e86e4ca8..56be09ee795a6da0a121d4889bfa217388181441 100644
--- a/Source/core/events/AnimationPlayerEvent.h
+++ b/Source/core/events/AnimationPlayerEvent.h
@@ -26,12 +26,12 @@ public:
         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();