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

Source/core/animation/IntegerOptionalIntegerSVGInterpolation.cpp

Index: Source/core/animation/IntegerOptionalIntegerSVGInterpolation.cpp
diff --git a/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.cpp b/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.cpp
index 3b559b0e80443a8216943363cb9bd52898ea3bb4..60991b26f59fac4c2c5173bd64a751a1075770c7 100644
--- a/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.cpp
+++ b/Source/core/animation/IntegerOptionalIntegerSVGInterpolation.cpp
@@ -20,21 +20,19 @@ PassRefPtrWillBeRawPtr<SVGInteger> toPositiveInteger(const InterpolableValue* nu
 
 } // namespace
 
-PassOwnPtrWillBeRawPtr<InterpolableValue> IntegerOptionalIntegerSVGInterpolation::toInterpolableValue(SVGPropertyBase* value)
+InterpolableValue* IntegerOptionalIntegerSVGInterpolation::toInterpolableValue(SVGPropertyBase* value)
 {
     RefPtrWillBeRawPtr<SVGIntegerOptionalInteger> integerOptionalInteger = toSVGIntegerOptionalInteger(value);
-    OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(2);
+    InterpolableList* result = InterpolableList::create(2);
     result->set(0, InterpolableNumber::create(integerOptionalInteger->firstInteger()->value()));
     result->set(1, InterpolableNumber::create(integerOptionalInteger->secondInteger()->value()));
-    return result.release();
+    return result;
 }
 
 PassRefPtrWillBeRawPtr<SVGIntegerOptionalInteger> IntegerOptionalIntegerSVGInterpolation::fromInterpolableValue(const InterpolableValue& value, int min)
 {
     const InterpolableList& list = toInterpolableList(value);
-    return SVGIntegerOptionalInteger::create(
-        toPositiveInteger(list.get(0), min),
-        toPositiveInteger(list.get(1), min));
+    return SVGIntegerOptionalInteger::create(toPositiveInteger(list.get(0), min), toPositiveInteger(list.get(1), min));
 }
 
 }