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

Source/core/animation/animatable/AnimatableLength.h

Index: Source/core/animation/animatable/AnimatableLength.h
diff --git a/Source/core/animation/animatable/AnimatableLength.h b/Source/core/animation/animatable/AnimatableLength.h
index d369e51065f46d8ab9e133ad4ca15c98c12f122a..36b9c0347fab6045cb4dd23a483ed42c3300e9f0 100644
--- a/Source/core/animation/animatable/AnimatableLength.h
+++ b/Source/core/animation/animatable/AnimatableLength.h
@@ -53,7 +53,7 @@ public:
     DEFINE_INLINE_VIRTUAL_TRACE() { AnimatableValue::trace(visitor); }
 
 protected:
-    virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
 
 private:
     static PassRefPtrWillBeRawPtr<AnimatableLength> create(double pixels, double percent, bool hasPixels, bool hasPercent)
@@ -69,8 +69,8 @@ private:
     {
         ASSERT(m_hasPixels || m_hasPercent);
     }
-    virtual AnimatableType type() const override { return TypeLength; }
-    virtual bool equalTo(const AnimatableValue*) const override;
+    AnimatableType type() const override { return TypeLength; }
+    bool equalTo(const AnimatableValue*) const override;
 
     double m_pixels;
     double m_percent;