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 2d1fd6c509dfb4166b46253feeff789e2a18218c..306bf26caf7e385b815eae3d7643311f3df88da1 100644
--- a/Source/core/animation/AnimationPlayer.h
+++ b/Source/core/animation/AnimationPlayer.h
@@ -41,7 +41,8 @@ class AnimationTimeline;
 class ExceptionState;
 
 class AnimationPlayer FINAL : public RefCountedWillBeRefCountedGarbageCollected<AnimationPlayer>, public EventTargetWithInlineData {
-    DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<AnimationPlayer>);
+    REFCOUNTED_EVENT_TARGET(AnimationPlayer);
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AnimationPlayer);
 public:
 
     ~AnimationPlayer();
@@ -147,7 +148,7 @@ public:
 
     virtual bool addEventListener(const AtomicString& eventType, PassRefPtr<EventListener>, bool useCapture = false) OVERRIDE;
 
-    void trace(Visitor*);
+    virtual void trace(Visitor*) OVERRIDE;
 
 private:
     AnimationPlayer(AnimationTimeline&, AnimationSource*);