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

Source/core/animation/LengthSVGInterpolation.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 LengthSVGInterpolation_h
 #define LengthSVGInterpolation_h
 
 #include "core/animation/SVGInterpolation.h"
 #include "core/svg/SVGLength.h"
 #include "core/svg/SVGLengthList.h"
 
 namespace blink {
 
 class LengthSVGInterpolation : public SVGInterpolation {
 public:
     typedef SVGLengthList ListType;
     struct NonInterpolableType {
         DISALLOW_ALLOCATION();
         SVGLengthMode unitMode;
         SVGLengthNegativeValuesMode negativeValuesMode;
     };
 
     static bool canCreateFrom(SVGLength*, SVGLength*)
     {
         return true;
     }
 
     static PassRefPtrWillBeRawPtr<SVGLengthList> createList(const SVGAnimatedPropertyBase&);
 
-    static PassRefPtrWillBeRawPtr<LengthSVGInterpolation> create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute);
+    static LengthSVGInterpolation* create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute);
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(SVGLength*, const SVGAnimatedPropertyBase*, NonInterpolableType*);
+    static InterpolableValue* toInterpolableValue(SVGLength*, const SVGAnimatedPropertyBase*, NonInterpolableType*);
 
     static PassRefPtrWillBeRawPtr<SVGLength> fromInterpolableValue(const InterpolableValue&, const NonInterpolableType&, const SVGElement*);
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         SVGInterpolation::trace(visitor);
     }
 
     PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const final;
 
 private:
-    LengthSVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, const NonInterpolableType& modeData)
+    LengthSVGInterpolation(InterpolableValue* start, InterpolableValue* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, const NonInterpolableType& modeData)
         : SVGInterpolation(start, end, attribute)
         , m_modeData(modeData)
     {
     }
 
     const NonInterpolableType m_modeData;
 };
 
 }
 
 #endif // LengthSVGInterpolation_h