Remove tons of OILPAN.

sky/engine/core/animation/StringKeyframe.h

Index: sky/engine/core/animation/StringKeyframe.h
diff --git a/sky/engine/core/animation/StringKeyframe.h b/sky/engine/core/animation/StringKeyframe.h
index 9dea079e61fbe8adefd4f4cafeba1cf100f48db7..9159825a20bbc6ea58b02a51b1d6503caf5e4c47 100644
--- a/sky/engine/core/animation/StringKeyframe.h
+++ b/sky/engine/core/animation/StringKeyframe.h
@@ -28,8 +28,6 @@ public:
     }
     virtual PropertySet properties() const override;
 
-    virtual void trace(Visitor*) override;
-
     class PropertySpecificKeyframe : public Keyframe::PropertySpecificKeyframe {
     public:
         PropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, CSSValue*, AnimationEffect::CompositeOperation);
@@ -42,8 +40,6 @@ public:
         virtual PassOwnPtr<Keyframe::PropertySpecificKeyframe> neutralKeyframe(double offset, PassRefPtr<TimingFunction> easing) const override final;
         virtual PassRefPtr<Interpolation> createInterpolation(CSSPropertyID, blink::Keyframe::PropertySpecificKeyframe* end, Element*) const override final;
 
-        virtual void trace(Visitor*) override;
-
     private:
         PropertySpecificKeyframe(double offset, PassRefPtr<TimingFunction> easing, CSSValue*);