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

Source/core/animation/NumberOptionalNumberSVGInterpolation.h

Index: Source/core/animation/NumberOptionalNumberSVGInterpolation.h
diff --git a/Source/core/animation/NumberOptionalNumberSVGInterpolation.h b/Source/core/animation/NumberOptionalNumberSVGInterpolation.h
index 37d72cdd246a5502ab4a4f6130b95b1415fdeade..14e66ef700e1efc02d08050904fd1786c0d210e0 100644
--- a/Source/core/animation/NumberOptionalNumberSVGInterpolation.h
+++ b/Source/core/animation/NumberOptionalNumberSVGInterpolation.h
@@ -15,9 +15,9 @@ class SVGNumberOptionalNumber;
 
 class NumberOptionalNumberSVGInterpolation : public SVGInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<NumberOptionalNumberSVGInterpolation> create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
+    static NumberOptionalNumberSVGInterpolation* create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
     {
-        return adoptRefWillBeNoop(new NumberOptionalNumberSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute));
+        return new NumberOptionalNumberSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute);
     }
 
     PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const final
@@ -31,18 +31,18 @@ public:
     }
 
 private:
-    NumberOptionalNumberSVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
+    NumberOptionalNumberSVGInterpolation(InterpolableValue* start, InterpolableValue* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
         : SVGInterpolation(start, end, attribute)
     {
     }
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(SVGPropertyBase* value)
+    static InterpolableValue* toInterpolableValue(SVGPropertyBase* value)
     {
         RefPtrWillBeRawPtr<SVGNumberOptionalNumber> numberOptionalNumber = toSVGNumberOptionalNumber(value);
-        OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(2);
+        InterpolableList* result = InterpolableList::create(2);
         result->set(0, InterpolableNumber::create(numberOptionalNumber->firstNumber()->value()));
         result->set(1, InterpolableNumber::create(numberOptionalNumber->secondNumber()->value()));
-        return result.release();
+        return result;
     }
 
     static PassRefPtrWillBeRawPtr<SVGNumberOptionalNumber> fromInterpolableValue(const InterpolableValue& value)