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

Source/core/animation/FilterStyleInterpolation.h

Index: Source/core/animation/FilterStyleInterpolation.h
diff --git a/Source/core/animation/FilterStyleInterpolation.h b/Source/core/animation/FilterStyleInterpolation.h
index 4d5624097793f3feb6a43a33b7162bee7ca6d2ee..53c60a6cfa3282e3ed6149eb253287f97749498a 100644
--- a/Source/core/animation/FilterStyleInterpolation.h
+++ b/Source/core/animation/FilterStyleInterpolation.h
@@ -16,15 +16,15 @@ public:
     typedef CSSValueID NonInterpolableType;
     typedef ListStyleInterpolationImpl<FilterStyleInterpolation, NonInterpolableType> FilterListStyleInterpolation;
 
-    static PassRefPtrWillBeRawPtr<FilterListStyleInterpolation> maybeCreateList(const CSSValue& start, const CSSValue& end, CSSPropertyID);
+    static FilterListStyleInterpolation* maybeCreateList(const CSSValue& start, const CSSValue& end, CSSPropertyID);
 
     // The following are called by ListStyleInterpolation.
     static bool canCreateFrom(const CSSValue& start, const CSSValue& end);
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(const CSSValue&, CSSValueID&);
+    static InterpolableValue* toInterpolableValue(const CSSValue&, CSSValueID&);
     static PassRefPtrWillBeRawPtr<CSSFunctionValue> fromInterpolableValue(const InterpolableValue&, CSSValueID, InterpolationRange = RangeAll);
 
 private:
-    FilterStyleInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, CSSPropertyID id)
+    FilterStyleInterpolation(InterpolableValue* start, InterpolableValue* end, CSSPropertyID id)
         : StyleInterpolation(start, end, id)
     {
     }