Remove tons of OILPAN.

sky/engine/core/animation/ActiveAnimations.h

Index: sky/engine/core/animation/ActiveAnimations.h
diff --git a/sky/engine/core/animation/ActiveAnimations.h b/sky/engine/core/animation/ActiveAnimations.h
index 4955033bee150271a37caec7e6a43f4c741b4973..b411bb10816df2a0027418e7b8d4b1fde89900c0 100644
--- a/sky/engine/core/animation/ActiveAnimations.h
+++ b/sky/engine/core/animation/ActiveAnimations.h
@@ -79,8 +79,6 @@ public:
     void addAnimation(Animation* animation) { m_animations.append(animation); }
     void notifyAnimationDestroyed(Animation* animation) { m_animations.remove(m_animations.find(animation)); }
 
-    void trace(Visitor*);
-
 private:
     bool isAnimationStyleChange() const { return m_animationStyleChange; }