Oilpan: move RenderObjects off heap.

Source/core/rendering/RenderFrameSet.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 39 matching lines @@
 
 private:
     Vector<bool> m_preventResize;
     Vector<bool> m_allowBorder;
 };
 
 class RenderFrameSet final : public RenderBox {
 public:
     RenderFrameSet(HTMLFrameSetElement*);
     virtual ~RenderFrameSet();
-    virtual void trace(Visitor*) override;
 
     RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
     RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
 
     // If you have a RenderFrameSet, use firstChild or lastChild instead.
     void slowFirstChild() const = delete;
     void slowLastChild() const = delete;
 
     const RenderObjectChildList* children() const { return &m_children; }
     RenderObjectChildList* children() { return &m_children; }
@@ skipping 60 matching lines @@
 
     bool m_isResizing;
     bool m_isChildResizing;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderFrameSet, isFrameSet());
 
 } // namespace blink
 
 #endif // RenderFrameSet_h