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

Source/core/rendering/RenderTableRow.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.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 138 matching lines @@
 
     ASSERT(!beforeChild || beforeChild->isTableCell());
     RenderBox::addChild(cell, beforeChild);
 
     if (beforeChild || nextSibling())
         section()->setNeedsCellRecalc();
 }
 
 void RenderTableRow::layout()
 {
-    StackStats::LayoutCheckPoint layoutCheckPoint;
     ASSERT(needsLayout());
 
     // Table rows do not add translation.
     LayoutStateMaintainer statePusher(view(), this, LayoutSize(), style()->isFlippedBlocksWritingMode());
 
     bool paginated = view()->layoutState()->isPaginated();
 
     for (RenderObject* child = firstChild(); child; child = child->nextSibling()) {
         if (child->isTableCell()) {
             SubtreeLayoutScope layouter(child);
@@ skipping 106 matching lines @@
 
 RenderTableRow* RenderTableRow::createAnonymousWithParentRenderer(const RenderObject* parent)
 {
     RenderTableRow* newRow = RenderTableRow::createAnonymous(parent->document());
     RefPtr<RenderStyle> newStyle = RenderStyle::createAnonymousStyleWithDisplay(parent->style(), TABLE_ROW);
     newRow->setStyle(newStyle.release());
     return newRow;
 }
 
 } // namespace WebCore