Oilpan: Allocate all EventTarget derived types on the manged heap.

Source/core/animation/AnimationPlayer.h

Index: Source/core/animation/AnimationPlayer.h
diff --git a/Source/core/animation/AnimationPlayer.h b/Source/core/animation/AnimationPlayer.h
index eef59c5e3c6bab0d1068babbb5cfd4b72337dd5f..e0c44eb72a992fe348ffadb11a53d50a15af47d6 100644
--- a/Source/core/animation/AnimationPlayer.h
+++ b/Source/core/animation/AnimationPlayer.h
@@ -44,7 +44,8 @@ class ExceptionState;
 class AnimationPlayer FINAL : public RefCountedWillBeRefCountedGarbageCollected<AnimationPlayer>
     , public ActiveDOMObject
     , public EventTargetWithInlineData {
-    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<AnimationPlayer>);
+    REFCOUNTED_EVENT_TARGET(AnimationPlayer);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AnimationPlayer);
 public:
 
     ~AnimationPlayer();
@@ -153,7 +154,7 @@ public:
 
     virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture = false) OVERRIDE;
 
-    void trace(Visitor*);
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
     AnimationPlayer(ExecutionContext*, AnimationTimeline&, AnimationNode*);