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

Source/core/animation/animatable/AnimatableShadow.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #define AnimatableShadow_h
 
 #include "core/animation/animatable/AnimatableValue.h"
 #include "core/style/ShadowList.h"
 
 namespace blink {
 
 class AnimatableShadow final : public AnimatableValue {
 public:
     ~AnimatableShadow() override { }
-    static PassRefPtrWillBeRawPtr<AnimatableShadow> create(PassRefPtr<ShadowList> shadowList, const Color& currentColor)
+    static AnimatableShadow* create(PassRefPtr<ShadowList> shadowList, const Color& currentColor)
     {
-        return adoptRefWillBeNoop(new AnimatableShadow(shadowList, currentColor));
+        return new AnimatableShadow(shadowList, currentColor);
     }
     ShadowList* shadowList() const { return m_shadowList.get(); }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { AnimatableValue::trace(visitor); }
 
 protected:
-    PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    AnimatableValue* interpolateTo(const AnimatableValue*, double fraction) const override;
     bool usesDefaultInterpolationWith(const AnimatableValue*) const override;
 
 private:
     explicit AnimatableShadow(PassRefPtr<ShadowList> shadowList, const Color& currentColor)
         : m_shadowList(shadowList),
         m_currentColor(currentColor)
     {
     }
     AnimatableType type() const override { return TypeShadow; }
     bool equalTo(const AnimatableValue*) const override;
 
     const RefPtr<ShadowList> m_shadowList;
     const Color m_currentColor;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableShadow, isShadow());
 
 } // namespace blink
 
 #endif // AnimatableShadow_h