[Oilpan] Migrate most classes under core/animations to Oilpan heap.

Source/core/animation/DeferredLegacyStyleInterpolation.h

Index: Source/core/animation/DeferredLegacyStyleInterpolation.h
diff --git a/Source/core/animation/DeferredLegacyStyleInterpolation.h b/Source/core/animation/DeferredLegacyStyleInterpolation.h
index 1c624ae790c3ea39081d456841d07f35c22de0ad..83a1257aa17c42bfb6febf36e56f71963b4f2b94 100644
--- a/Source/core/animation/DeferredLegacyStyleInterpolation.h
+++ b/Source/core/animation/DeferredLegacyStyleInterpolation.h
@@ -21,9 +21,9 @@ class CSSValueList;
 
 class CORE_EXPORT DeferredLegacyStyleInterpolation : public StyleInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<DeferredLegacyStyleInterpolation> create(PassRefPtrWillBeRawPtr<CSSValue> start, PassRefPtrWillBeRawPtr<CSSValue> end, CSSPropertyID id)
+    static DeferredLegacyStyleInterpolation* create(PassRefPtrWillBeRawPtr<CSSValue> start, PassRefPtrWillBeRawPtr<CSSValue> end, CSSPropertyID id)
     {
-        return adoptRefWillBeNoop(new DeferredLegacyStyleInterpolation(start, end, id));
+        return new DeferredLegacyStyleInterpolation(start, end, id);
     }
 
     void apply(StyleResolverState&) const override;
@@ -53,7 +53,7 @@ private:
 
     RefPtrWillBeMember<CSSValue> m_startCSSValue;
     RefPtrWillBeMember<CSSValue> m_endCSSValue;
-    mutable RefPtrWillBeMember<LegacyStyleInterpolation> m_innerInterpolation;
+    mutable Member<LegacyStyleInterpolation> m_innerInterpolation;
     mutable bool m_outdated;
 };