Remove most of visited link support.

sky/engine/core/animation/animatable/AnimatableColor.h

Index: sky/engine/core/animation/animatable/AnimatableColor.h
diff --git a/sky/engine/core/animation/animatable/AnimatableColor.h b/sky/engine/core/animation/animatable/AnimatableColor.h
index cca1c4e315318c86f0e6ee8ae812b2b8d9c2fcc6..7589a0588c645e9c1b0f3742b2817cd349256d6f 100644
--- a/sky/engine/core/animation/animatable/AnimatableColor.h
+++ b/sky/engine/core/animation/animatable/AnimatableColor.h
@@ -58,9 +58,8 @@ private:
 // but inefficient.
 class AnimatableColor FINAL : public AnimatableValue {
 public:
-    static PassRefPtrWillBeRawPtr<AnimatableColor> create(const AnimatableColorImpl&, const AnimatableColorImpl& visitedLinkColor);
+    static PassRefPtrWillBeRawPtr<AnimatableColor> create(const AnimatableColorImpl&);
     Color color() const { return m_color.toColor(); }
-    Color visitedLinkColor() const { return m_visitedLinkColor.toColor(); }
 
     virtual void trace(Visitor* visitor) OVERRIDE { AnimatableValue::trace(visitor); }
 
@@ -68,16 +67,14 @@ protected:
     virtual PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const OVERRIDE;
 
 private:
-    AnimatableColor(const AnimatableColorImpl& color, const AnimatableColorImpl& visitedLinkColor)
+    AnimatableColor(const AnimatableColorImpl& color)
         : m_color(color)
-        , m_visitedLinkColor(visitedLinkColor)
     {
     }
     virtual AnimatableType type() const OVERRIDE { return TypeColor; }
     virtual bool equalTo(const AnimatableValue*) const OVERRIDE;
     virtual double distanceTo(const AnimatableValue*) const OVERRIDE;
     const AnimatableColorImpl m_color;
-    const AnimatableColorImpl m_visitedLinkColor;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableColor, isColor());