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

Source/core/animation/CSSValueInterpolationType.cpp

 // 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.
 
 #include "config.h"
 #include "core/animation/CSSValueInterpolationType.h"
 
 #include "core/css/resolver/StyleBuilder.h"
 
 namespace blink {
 
 class CSSValueNonInterpolableValue : public NonInterpolableValue {
 public:
     ~CSSValueNonInterpolableValue() override { }
-    static PassRefPtrWillBeRawPtr<CSSValueNonInterpolableValue> create(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
+    static CSSValueNonInterpolableValue* create(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
     {
-        return adoptRefWillBeNoop(new CSSValueNonInterpolableValue(cssValue));
+        return new CSSValueNonInterpolableValue(cssValue);
     }
 
     CSSValue* cssValue() const { return m_cssValue.get(); }
 
     DEFINE_INLINE_VIRTUAL_TRACE()
     {
         NonInterpolableValue::trace(visitor);
         visitor->trace(m_cssValue);
     }
 
     DECLARE_NON_INTERPOLABLE_VALUE_TYPE();
 
 private:
     CSSValueNonInterpolableValue(PassRefPtrWillBeRawPtr<CSSValue> cssValue)
         : m_cssValue(cssValue)
     { }
 
     RefPtrWillBeMember<CSSValue> m_cssValue;
 };
 
 DEFINE_NON_INTERPOLABLE_VALUE_TYPE(CSSValueNonInterpolableValue);
 DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(CSSValueNonInterpolableValue);
 
-PassOwnPtrWillBeRawPtr<InterpolationValue> CSSValueInterpolationType::maybeConvertSingle(const CSSPropertySpecificKeyframe& keyframe, const StyleResolverState*, ConversionCheckers&) const
+InterpolationValue* CSSValueInterpolationType::maybeConvertSingle(const CSSPropertySpecificKeyframe& keyframe, const StyleResolverState*, ConversionCheckers&) const
 {
     return InterpolationValue::create(*this, InterpolableList::create(0), CSSValueNonInterpolableValue::create(keyframe.value()));
 }
 
 void CSSValueInterpolationType::apply(const InterpolableValue&, const NonInterpolableValue* nonInterpolableValue, StyleResolverState& state) const
 {
     CSSValue* value = toCSSValueNonInterpolableValue(nonInterpolableValue)->cssValue();
     if (value)
         StyleBuilder::applyProperty(m_property, state, value);
 }
 
 } // namespace blink