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

Source/core/animation/CSSValueInterpolationType.h

Index: Source/core/animation/CSSValueInterpolationType.h
diff --git a/Source/core/animation/CSSValueInterpolationType.h b/Source/core/animation/CSSValueInterpolationType.h
index aa6ca5c884fb1aaa39049f796964454258d18654..e2dfbfa6d6b527077c6987f1826e7ef4360db848 100644
--- a/Source/core/animation/CSSValueInterpolationType.h
+++ b/Source/core/animation/CSSValueInterpolationType.h
@@ -17,14 +17,14 @@ public:
         : InterpolationType(property)
     { }
 
-    PassOwnPtrWillBeRawPtr<PairwisePrimitiveInterpolation> maybeConvertPairwise(const CSSPropertySpecificKeyframe& startKeyframe, const CSSPropertySpecificKeyframe& endKeyframe, const StyleResolverState* state, ConversionCheckers&) const final
+    PairwisePrimitiveInterpolation* maybeConvertPairwise(const CSSPropertySpecificKeyframe& startKeyframe, const CSSPropertySpecificKeyframe& endKeyframe, const StyleResolverState* state, ConversionCheckers&) const final
     {
         return nullptr;
     }
 
-    PassOwnPtrWillBeRawPtr<InterpolationValue> maybeConvertSingle(const CSSPropertySpecificKeyframe&, const StyleResolverState*, ConversionCheckers&) const final;
+    InterpolationValue* maybeConvertSingle(const CSSPropertySpecificKeyframe&, const StyleResolverState*, ConversionCheckers&) const final;
 
-    PassOwnPtrWillBeRawPtr<InterpolationValue> maybeConvertUnderlyingValue(const StyleResolverState&) const final
+    InterpolationValue* maybeConvertUnderlyingValue(const StyleResolverState&) const final
     {
         return nullptr;
     }