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

Source/core/animation/VisibilityStyleInterpolation.h

 #ifndef VisibilityStyleInterpolation_h
 #define VisibilityStyleInterpolation_h
 
 #include "core/CSSValueKeywords.h"
 #include "core/CoreExport.h"
 #include "core/animation/StyleInterpolation.h"
 #include "core/css/CSSPrimitiveValue.h"
 
 namespace blink {
 
 class CORE_EXPORT VisibilityStyleInterpolation : public StyleInterpolation {
 public:
     static PassRefPtrWillBeRawPtr<VisibilityStyleInterpolation> create(const CSSValue& start, const CSSValue& end, CSSPropertyID id)
     {
         RefPtrWillBeRawPtr<VisibilityStyleInterpolation> interpolation = adoptRefWillBeNoop(new VisibilityStyleInterpolation(
             visibilityToInterpolableValue(start), visibilityToInterpolableValue(end), id));
         if (!isVisible(start)) {
             interpolation->m_notVisible = toCSSPrimitiveValue(start).getValueID();
         } else if (!isVisible(end)) {
             interpolation->m_notVisible = toCSSPrimitiveValue(end).getValueID();
         }
 
         return interpolation.release();
     }
 
     static bool canCreateFrom(const CSSValue&);
     static bool isVisible(const CSSValue&);
 
-    virtual void apply(StyleResolverState&) const override;
+    void apply(StyleResolverState&) const override;
     DECLARE_VIRTUAL_TRACE();
 
 private:
     VisibilityStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id)
         : StyleInterpolation(start, end, id)
         , m_notVisible(CSSValueVisible)
     {
     }
 
     static PassOwnPtrWillBeRawPtr<InterpolableValue> visibilityToInterpolableValue(const CSSValue&);
     static PassRefPtrWillBeRawPtr<CSSValue> interpolableValueToVisibility(InterpolableValue*, CSSValueID);
 
     CSSValueID m_notVisible;
 
     friend class AnimationVisibilityStyleInterpolationTest;
 };
 }
 
 #endif