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

Source/core/animation/PointSVGInterpolation.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PointSVGInterpolation_h
 #define PointSVGInterpolation_h
 
 #include "core/animation/SVGInterpolation.h"
 #include "core/svg/SVGPointList.h"
 #include "wtf/Allocator.h"
 
 namespace blink {
 
 class PointSVGInterpolation {
     STATIC_ONLY(PointSVGInterpolation);
 public:
     typedef SVGPointList ListType;
     typedef void NonInterpolableType;
 
-    static PassOwnPtrWillBeRawPtr<InterpolableList> toInterpolableValue(SVGPropertyBase* item)
+    static InterpolableList* toInterpolableValue(SVGPropertyBase* item)
     {
-        OwnPtrWillBeRawPtr<InterpolableList> result = InterpolableList::create(2);
+        InterpolableList* result = InterpolableList::create(2);
         result->set(0, InterpolableNumber::create(toSVGPoint(item)->x()));
         result->set(1, InterpolableNumber::create(toSVGPoint(item)->y()));
-        return result.release();
+        return result;
     }
 
     static PassRefPtrWillBeRawPtr<SVGPoint> fromInterpolableValue(const InterpolableValue& value)
     {
         const InterpolableList& list = toInterpolableList(value);
         return SVGPoint::create(FloatPoint(
             toInterpolableNumber(list.get(0))->value(),
             toInterpolableNumber(list.get(1))->value()));
     }
 };
 
 }
 
 #endif // PointSVGInterpolation_h