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

Source/core/animation/CSSValueInterpolationType.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 CSSValueInterpolationType_h
 #define CSSValueInterpolationType_h
 
 #include "core/animation/InterpolationType.h"
 
 namespace blink {
 
 // Never supports pairwise conversion while always supporting single conversion.
 // A catch all for default for CSSValues.
 class CSSValueInterpolationType : public InterpolationType {
 public:
     CSSValueInterpolationType(CSSPropertyID property)
         : InterpolationType(property)
     { }
 
-    PassOwnPtrWillBeRawPtr<PairwisePrimitiveInterpolation> maybeConvertPairwise(const CSSPropertySpecificKeyframe& startKeyframe, const CSSPropertySpecificKeyframe& endKeyframe, const StyleResolverState* state, ConversionCheckers&) const final
+    PairwisePrimitiveInterpolation* maybeConvertPairwise(const CSSPropertySpecificKeyframe& startKeyframe, const CSSPropertySpecificKeyframe& endKeyframe, const StyleResolverState* state, ConversionCheckers&) const final
     {
         return nullptr;
     }
 
-    PassOwnPtrWillBeRawPtr<InterpolationValue> maybeConvertSingle(const CSSPropertySpecificKeyframe&, const StyleResolverState*, ConversionCheckers&) const final;
+    InterpolationValue* maybeConvertSingle(const CSSPropertySpecificKeyframe&, const StyleResolverState*, ConversionCheckers&) const final;
 
-    PassOwnPtrWillBeRawPtr<InterpolationValue> maybeConvertUnderlyingValue(const StyleResolverState&) const final
+    InterpolationValue* maybeConvertUnderlyingValue(const StyleResolverState&) const final
     {
         return nullptr;
     }
 
     void apply(const InterpolableValue&, const NonInterpolableValue*, StyleResolverState&) const final;
 };
 
 } // namespace blink
 
 #endif // CSSValueInterpolationType_h