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

Source/core/animation/IntegerSVGInterpolation.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 IntegerSVGInterpolation_h
 #define IntegerSVGInterpolation_h
 
 #include "core/animation/SVGInterpolation.h"
 #include "core/svg/SVGInteger.h"
 
 namespace blink {
 
 class IntegerSVGInterpolation : public SVGInterpolation {
 public:
-    static PassRefPtrWillBeRawPtr<IntegerSVGInterpolation> create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
+    static IntegerSVGInterpolation* create(SVGPropertyBase* start, SVGPropertyBase* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
     {
-        return adoptRefWillBeNoop(new IntegerSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute));
+        return new IntegerSVGInterpolation(toInterpolableValue(start), toInterpolableValue(end), attribute);
     }
 
     PassRefPtrWillBeRawPtr<SVGPropertyBase> interpolatedValue(SVGElement&) const final
     {
         return fromInterpolableValue(*m_cachedValue);
     }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         SVGInterpolation::trace(visitor);
     }
 
 private:
-    IntegerSVGInterpolation(PassOwnPtrWillBeRawPtr<InterpolableValue> start, PassOwnPtrWillBeRawPtr<InterpolableValue> end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
+    IntegerSVGInterpolation(InterpolableValue* start, InterpolableValue* end, PassRefPtrWillBeRawPtr<SVGAnimatedPropertyBase> attribute)
         : SVGInterpolation(start, end, attribute)
     {
     }
 
-    static PassOwnPtrWillBeRawPtr<InterpolableValue> toInterpolableValue(SVGPropertyBase* value)
+    static InterpolableValue* toInterpolableValue(SVGPropertyBase* value)
     {
         return InterpolableNumber::create(toSVGInteger(value)->value());
     }
 
     static PassRefPtrWillBeRawPtr<SVGInteger> fromInterpolableValue(const InterpolableValue& value)
     {
         return SVGInteger::create(clampTo<int>(roundf(toInterpolableNumber(value).value())));
     }
 };
 
 }
 
 #endif // IntegerSVGInterpolation_h