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

Source/core/rendering/RenderFrameSet.cpp

 /**
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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 33 matching lines @@
     , m_isResizing(false)
     , m_isChildResizing(false)
 {
     setInline(false);
 }
 
 RenderFrameSet::~RenderFrameSet()
 {
 }
 
+void RenderFrameSet::trace(Visitor* visitor)
+{
+    visitor->trace(m_children);
+    RenderBox::trace(visitor);
+}
+
 RenderFrameSet::GridAxis::GridAxis()
     : m_splitBeingResized(noSplit)
 {
 }
 
 inline HTMLFrameSetElement* RenderFrameSet::frameSet() const
 {
     return toHTMLFrameSetElement(node());
 }
 
@@ skipping 589 matching lines @@
         return SetCursor;
     }
     if (canResizeColumn(roundedPoint)) {
         cursor = columnResizeCursor();
         return SetCursor;
     }
     return RenderBox::getCursor(point, cursor);
 }
 
 } // namespace blink