Remove tons of OILPAN.

sky/engine/core/animation/AnimationNode.h

Index: sky/engine/core/animation/AnimationNode.h
diff --git a/sky/engine/core/animation/AnimationNode.h b/sky/engine/core/animation/AnimationNode.h
index 2b183ececf5c337e96d8c93d63bf8f25e1aefe7e..50f30da0ce9c67ff1e1dcf6f4cd083ebb5e1319a 100644
--- a/sky/engine/core/animation/AnimationNode.h
+++ b/sky/engine/core/animation/AnimationNode.h
@@ -75,7 +75,6 @@ public:
     public:
         virtual ~EventDelegate() { }
         virtual void onEventCondition(const AnimationNode*) = 0;
-        virtual void trace(Visitor*) { }
     };
 
     virtual ~AnimationNode() { }
@@ -113,8 +112,6 @@ public:
     double localTime(bool& isNull) const { isNull = !m_player; return ensureCalculated().localTime * 1000; }
     double currentIteration(bool& isNull) const { isNull = !ensureCalculated().isInEffect; return ensureCalculated().currentIteration; }
 
-    virtual void trace(Visitor*);
-
 protected:
     explicit AnimationNode(const Timing&, PassOwnPtr<EventDelegate> = nullptr);