Oilpan: Move AnimatableValue's hierarchy to oilpan's heap

Source/core/animation/AnimatableShadow.cpp

Index: Source/core/animation/AnimatableShadow.cpp
diff --git a/Source/core/animation/AnimatableShadow.cpp b/Source/core/animation/AnimatableShadow.cpp
index 4d1a847f319b7de819d8fe25a3f461aac6b45a53..fa9c8c367801837abc756d5aad9d59c9f5f0f6e4 100644
--- a/Source/core/animation/AnimatableShadow.cpp
+++ b/Source/core/animation/AnimatableShadow.cpp
@@ -33,13 +33,13 @@
 
 namespace WebCore {
 
-PassRefPtr<AnimatableValue> AnimatableShadow::interpolateTo(const AnimatableValue* value, double fraction) const
+PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableShadow::interpolateTo(const AnimatableValue* value, double fraction) const
 {
     const AnimatableShadow* shadowList = toAnimatableShadow(value);
     return AnimatableShadow::create(ShadowList::blend(m_shadowList.get(), shadowList->m_shadowList.get(), fraction));
 }
 
-PassRefPtr<AnimatableValue> AnimatableShadow::addWith(const AnimatableValue* value) const
+PassRefPtrWillBeRawPtr<AnimatableValue> AnimatableShadow::addWith(const AnimatableValue* value) const
 {
     // FIXME: The spec doesn't specify anything for shadow in particular, but
     // the default behaviour is probably not what one would expect.