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

Source/core/animation/DeferredLegacyStyleInterpolation.cpp

 // Copyright 2014 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/DeferredLegacyStyleInterpolation.h"
 
 #include "core/animation/ElementAnimations.h"
 #include "core/animation/css/CSSAnimatableValueFactory.h"
 #include "core/css/CSSImageValue.h"
 #include "core/css/CSSPrimitiveValue.h"
 #include "core/css/CSSSVGDocumentValue.h"
 #include "core/css/CSSShadowValue.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/Pair.h"
 #include "core/css/Rect.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/css/resolver/StyleResolverState.h"
 
 namespace blink {
 
 void DeferredLegacyStyleInterpolation::apply(StyleResolverState& state) const
 {
     if (m_outdated || !state.element()->elementAnimations() || !state.element()->elementAnimations()->isAnimationStyleChange()) {
-        RefPtrWillBeRawPtr<AnimatableValue> startAnimatableValue;
-        RefPtrWillBeRawPtr<AnimatableValue> endAnimatableValue;
+        AnimatableValue* startAnimatableValue;
+        AnimatableValue* endAnimatableValue;
 
         // Snapshot underlying values for neutral keyframes first because non-neutral keyframes will mutate the StyleResolverState.
         if (!m_endCSSValue) {
             endAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_endCSSValue.get());
             startAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_startCSSValue.get());
         } else {
             startAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_startCSSValue.get());
             endAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_endCSSValue.get());
         }
 
@@ skipping 113 matching lines @@
 
 DEFINE_TRACE(DeferredLegacyStyleInterpolation)
 {
     visitor->trace(m_startCSSValue);
     visitor->trace(m_endCSSValue);
     visitor->trace(m_innerInterpolation);
     StyleInterpolation::trace(visitor);
 }
 
 }