Avoid leaking ThreadingPrimitives.h from StackStats.h when collection is off.

Source/core/rendering/RenderTable.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 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 384 matching lines @@
 void RenderTable::simplifiedNormalFlowLayout()
 {
     for (RenderTableSection* section = topSection(); section; section = sectionBelow(section)) {
         section->layoutIfNeeded();
         section->computeOverflowFromCells();
     }
 }
 
 void RenderTable::layout()
 {
-    StackStats::LayoutCheckPoint layoutCheckPoint;
     ASSERT(needsLayout());
 
     if (simplifiedLayout())
         return;
 
     recalcSectionsIfNeeded();
     // FIXME: We should do this recalc lazily in borderStart/borderEnd so that we don't have to make sure
     // to call this before we call borderStart/borderEnd to avoid getting a stale value.
     recalcBordersInRowDirection();
 
@@ skipping 1026 matching lines @@
 const BorderValue& RenderTable::tableEndBorderAdjoiningCell(const RenderTableCell* cell) const
 {
     ASSERT(cell->isFirstOrLastCellInRow());
     if (hasSameDirectionAs(cell->row()))
         return style()->borderEnd();
 
     return style()->borderStart();
 }
 
 }