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

Source/core/animation/IntegerOptionalIntegerSVGInterpolation.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 IntegerOptionalIntegerSVGInterpolation_h
 #define IntegerOptionalIntegerSVGInterpolation_h
 
 #include "core/animation/SVGInterpolation.h"
 #include "core/svg/SVGIntegerOptionalInteger.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class SVGIntegerOptionalInteger;
 
 class IntegerOptionalIntegerSVGInterpolation : public SVGInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<IntegerOptionalIntegerSVGInterpolation> create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
+    static IntegerOptionalIntegerSVGInterpolation* create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
     {
-        return adoptRefWillBeNoop(new IntegerOptionalIntegerSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute, min));
+        return new IntegerOptionalIntegerSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute, min);
     }
 
     virtual PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const override final
     {
         return fromInterpolableValue(*m_cachedValue, m_min);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         SVGInterpolation::trace(visitor);
     }
 
 private:
-    IntegerOptionalIntegerSVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
+    IntegerOptionalIntegerSVGInterpolation(InterpolableValue* start, InterpolableValue* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute, int min)
         : SVGInterpolation(start, end, attribute)
         , m_min(min)
     {
     }
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(SVGPropertyBase*);
+    static InterpolableValue* toInterpolableValue(SVGPropertyBase*);
 
     static PassRefPtrWillBeRawPtr<SVGIntegerOptionalInteger> fromInterpolableValue(const InterpolableValue&, int);
 
     const int m_min;
 };
 
 }
 
 #endif // IntegerOptionalIntegerSVGInterpolation_h