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

Source/core/animation/animatable/AnimatableLengthPoint.h

Index: Source/core/animation/animatable/AnimatableLengthPoint.h
diff --git a/Source/core/animation/animatable/AnimatableLengthPoint.h b/Source/core/animation/animatable/AnimatableLengthPoint.h
index d4bb8526145afe789e25ac7a872bba0a7c42c99b..8034de5abbbd8b6c25f60685c14719c6745b3d2e 100644
--- a/Source/core/animation/animatable/AnimatableLengthPoint.h
+++ b/Source/core/animation/animatable/AnimatableLengthPoint.h
@@ -37,7 +37,7 @@ namespace blink {
 
 class AnimatableLengthPoint final : public AnimatableValue {
 public:
-    virtual ~AnimatableLengthPoint() { }
+    ~AnimatableLengthPoint() override { }
     static PassRefPtrWillBeRawPtr<AnimatableLengthPoint> create(PassRefPtrWillBeRawPtr<AnimatableValue> x, PassRefPtrWillBeRawPtr<AnimatableValue> y)
     {
         return adoptRefWillBeNoop(new AnimatableLengthPoint(x, y));
@@ -48,7 +48,7 @@ public:
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
 
 private:
     AnimatableLengthPoint(PassRefPtrWillBeRawPtr<AnimatableValue> x, PassRefPtrWillBeRawPtr<AnimatableValue> y)
@@ -56,8 +56,8 @@ private:
         , m_y(y)
     {
     }
-    virtual AnimatableType type() const override { return TypeLengthPoint; }
-    virtual bool equalTo(const AnimatableValue*) const override;
+    AnimatableType type() const override { return TypeLengthPoint; }
+    bool equalTo(const AnimatableValue*) const override;
 
     RefPtrWillBeMember<AnimatableValue> m_x;
     RefPtrWillBeMember<AnimatableValue> m_y;