Move InterpolationEffect to oilpan's heap

Source/core/animation/KeyframeEffectModel.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 155 matching lines @@
     void ensureKeyframeGroups() const;
     void ensureInterpolationEffect() const;
 
     KeyframeVector m_keyframes;
     // The spec describes filtering the normalized keyframes at sampling time
     // to get the 'property-specific keyframes'. For efficiency, we cache the
     // property-specific lists.
     typedef WillBeHeapHashMap<CSSPropertyID, OwnPtrWillBeMember<PropertySpecificKeyframeGroup> > KeyframeGroupMap;
     mutable OwnPtrWillBeMember<KeyframeGroupMap> m_keyframeGroups;
 
-    mutable RefPtr<InterpolationEffect> m_interpolationEffect;
+    mutable RefPtrWillBeMember<InterpolationEffect> m_interpolationEffect;
 
     friend class KeyframeEffectModelTest;
 };
 
 DEFINE_TYPE_CASTS(KeyframeEffectModel, AnimationEffect, value, value->isKeyframeEffectModel(), value.isKeyframeEffectModel());
 
 } // namespace WebCore
 
 #endif // KeyframeEffectModel_h