Oilpan: Move AnimationNode::EventDelegate to oilpan's heap

Source/core/animation/css/CSSAnimations.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 209 matching lines @@
     class AnimationEventDelegate FINAL : public AnimationNode::EventDelegate {
     public:
         AnimationEventDelegate(Element* target, const AtomicString& name)
             : m_target(target)
             , m_name(name)
             , m_previousPhase(AnimationNode::PhaseNone)
             , m_previousIteration(nullValue())
         {
         }
         virtual void onEventCondition(const AnimationNode*) OVERRIDE;
+        virtual void trace(Visitor*) OVERRIDE;
+
     private:
         void maybeDispatch(Document::ListenerType, const AtomicString& eventName, double elapsedTime);
-        Element* m_target;
+        RawPtrWillBeMember<Element> m_target;
         const AtomicString m_name;
         AnimationNode::Phase m_previousPhase;
         double m_previousIteration;
     };
 
     class TransitionEventDelegate FINAL : public AnimationNode::EventDelegate {
     public:
         TransitionEventDelegate(Element* target, CSSPropertyID property)
             : m_target(target)
             , m_property(property)
             , m_previousPhase(AnimationNode::PhaseNone)
         {
         }
         virtual void onEventCondition(const AnimationNode*) OVERRIDE;
+        virtual void trace(Visitor*) OVERRIDE;
+
     private:
-        Element* m_target;
+        RawPtrWillBeMember<Element> m_target;
         const CSSPropertyID m_property;
         AnimationNode::Phase m_previousPhase;
     };
 };
 
 } // namespace blink
 
 WTF_ALLOW_INIT_WITH_MEM_FUNCTIONS(blink::CSSAnimationUpdate::NewAnimation);
 
 #endif