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

Source/core/animation/animatable/AnimatableLengthSize.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 20 matching lines @@
 #ifndef AnimatableLengthSize_h
 #define AnimatableLengthSize_h
 
 #include "core/animation/animatable/AnimatableValue.h"
 
 namespace blink {
 
 class AnimatableLengthSize final : public AnimatableValue {
 public:
     ~AnimatableLengthSize() override { }
-    static PassRefPtrWillBeRawPtr<AnimatableLengthSize> create(PassRefPtrWillBeRawPtr<AnimatableValue> width, PassRefPtrWillBeRawPtr<AnimatableValue> height)
+    static AnimatableLengthSize* create(AnimatableValue* width, AnimatableValue* height)
     {
-        return adoptRefWillBeNoop(new AnimatableLengthSize(width, height));
+        return new AnimatableLengthSize(width, height);
     }
-    const AnimatableValue* width() const { return m_width.get(); }
-    const AnimatableValue* height() const { return m_height.get(); }
+    const AnimatableValue* width() const { return m_width; }
+    const AnimatableValue* height() const { return m_height; }
 
     DECLARE_VIRTUAL_TRACE();
 
 protected:
-    PassRefPtrWillBeRawPtr<AnimatableValue> interpolateTo(const AnimatableValue*, double fraction) const override;
+    AnimatableValue* interpolateTo(const AnimatableValue*, double fraction) const override;
 
 private:
-    AnimatableLengthSize(PassRefPtrWillBeRawPtr<AnimatableValue> width, PassRefPtrWillBeRawPtr<AnimatableValue> height)
+    AnimatableLengthSize(AnimatableValue* width, AnimatableValue* height)
         : m_width(width)
         , m_height(height)
     {
     }
     AnimatableType type() const override { return TypeLengthSize; }
     bool equalTo(const AnimatableValue*) const override;
 
-    RefPtrWillBeMember<AnimatableValue> m_width;
-    RefPtrWillBeMember<AnimatableValue> m_height;
+    Member<AnimatableValue> m_width;
+    Member<AnimatableValue> m_height;
 };
 
 DEFINE_ANIMATABLE_VALUE_TYPE_CASTS(AnimatableLengthSize, isLengthSize());
 
 } // namespace blink
 
 #endif // AnimatableLengthSize_h