Fix virtual/override/final usage in Source/core/{animation,css,style}/.

Source/core/animation/css/CSSAnimations.h

Index: Source/core/animation/css/CSSAnimations.h
diff --git a/Source/core/animation/css/CSSAnimations.h b/Source/core/animation/css/CSSAnimations.h
index 6a72e4e50acc7078486d06594b3d18ee01c88ed2..93a8abfb1ad33de1876d2d9212ec3ce88fe568b5 100644
--- a/Source/core/animation/css/CSSAnimations.h
+++ b/Source/core/animation/css/CSSAnimations.h
@@ -140,8 +140,8 @@ private:
             , m_previousIteration(nullValue())
         {
         }
-        virtual bool requiresIterationEvents(const AnimationEffect&) override;
-        virtual void onEventCondition(const AnimationEffect&) override;
+        bool requiresIterationEvents(const AnimationEffect&) override;
+        void onEventCondition(const AnimationEffect&) override;
         DECLARE_VIRTUAL_TRACE();
 
     private:
@@ -164,8 +164,8 @@ private:
             , m_previousPhase(AnimationEffect::PhaseNone)
         {
         }
-        virtual bool requiresIterationEvents(const AnimationEffect&) override { return false; }
-        virtual void onEventCondition(const AnimationEffect&) override;
+        bool requiresIterationEvents(const AnimationEffect&) override { return false; }
+        void onEventCondition(const AnimationEffect&) override;
         DECLARE_VIRTUAL_TRACE();
 
     private: