Oilpan: Prepare to move RenderObject and RenderObjectChildList to Oilpan heap.

Source/core/rendering/svg/RenderSVGRoot.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 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 16 matching lines @@
 #include "platform/geometry/FloatRect.h"
 
 namespace blink {
 
 class SVGElement;
 
 class RenderSVGRoot FINAL : public RenderReplaced {
 public:
     explicit RenderSVGRoot(SVGElement*);
     virtual ~RenderSVGRoot();
+    virtual void trace(Visitor*) OVERRIDE;
 
     bool isEmbeddedThroughSVGImage() const;
     bool isEmbeddedThroughFrameContainingSVGDocument() const;
 
     virtual void computeIntrinsicRatioInformation(FloatSize& intrinsicSize, double& intrinsicRatio) const OVERRIDE;
 
     RenderObject* firstChild() const { ASSERT(children() == virtualChildren()); return children()->firstChild(); }
     RenderObject* lastChild() const { ASSERT(children() == virtualChildren()); return children()->lastChild(); }
 
     // If you have a RenderSVGRoot, use firstChild or lastChild instead.
@@ skipping 76 matching lines @@
     bool m_isLayoutSizeChanged : 1;
     bool m_needsBoundariesOrTransformUpdate : 1;
     bool m_hasBoxDecorationBackground : 1;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGRoot, isSVGRoot());
 
 } // namespace blink
 
 #endif // RenderSVGRoot_h