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

Source/core/animation/animatable/AnimatableLengthBoxAndBool.h

Index: Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
diff --git a/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h b/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
index 3b64b3f2b41fa9c48ebfd64b072cdbefe3fe3f15..56dc8ed6fe3a67a8b2e8cea1160c90f44b063e88 100644
--- a/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
+++ b/Source/core/animation/animatable/AnimatableLengthBoxAndBool.h
@@ -37,7 +37,7 @@ namespace blink {
 
 class AnimatableLengthBoxAndBool final : public AnimatableValue {
 public:
-    virtual ~AnimatableLengthBoxAndBool() { }
+    ~AnimatableLengthBoxAndBool() override { }
     static PassRefPtrWillBeRawPtr<AnimatableLengthBoxAndBool> create(PassRefPtrWillBeRawPtr<AnimatableValue> box, bool flag)
     {
         return adoptRefWillBeNoop(new AnimatableLengthBoxAndBool(box, flag));
@@ -48,8 +48,8 @@ public:
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
-    virtual bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
+    PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
 private:
     AnimatableLengthBoxAndBool(PassRefPtrWillBeRawPtr<AnimatableValue> box, bool flag)
@@ -57,8 +57,8 @@ private:
         , m_flag(flag)
     {
     }
-    virtual AnimatableType type() const override { return TypeLengthBoxAndBool; }
-    virtual bool equalTo(const AnimatableValue*) const override;
+    AnimatableType type() const override { return TypeLengthBoxAndBool; }
+    bool equalTo(const AnimatableValue*) const override;
 
     RefPtrWillBeMember<AnimatableValue> m_box;
     bool m_flag;