Oilpan: move RenderObjects off heap.

Source/core/layout/LayoutTableRow.cpp

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2013 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
@@ skipping 29 matching lines @@
 using namespace HTMLNames;
 
 LayoutTableRow::LayoutTableRow(Element* element)
     : RenderBox(element)
     , m_rowIndex(unsetRowIndex)
 {
     // init RenderObject attributes
     setInline(false); // our object is not Inline
 }
 
-void LayoutTableRow::trace(Visitor* visitor)
-{
-    visitor->trace(m_children);
-    RenderBox::trace(visitor);
-}
-
 void LayoutTableRow::willBeRemovedFromTree()
 {
     RenderBox::willBeRemovedFromTree();
 
     section()->setNeedsCellRecalc();
 }
 
 static bool borderWidthChanged(const RenderStyle* oldStyle, const RenderStyle* newStyle)
 {
     return oldStyle->borderLeftWidth() != newStyle->borderLeftWidth()
@@ skipping 191 matching lines @@
     // The cell and the row share the section's coordinate system. However
     // the visual overflow should be determined in the coordinate system of
     // the row, that's why we shift it below.
     LayoutUnit cellOffsetLogicalTopDifference = cell->location().y() - location().y();
     cellVisualOverflowRect.move(0, cellOffsetLogicalTopDifference);
 
     addVisualOverflow(cellVisualOverflowRect);
 }
 
 } // namespace blink