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

Source/core/rendering/svg/RenderSVGResourceMarker.cpp

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) Research In Motion Limited 2009-2010. 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 27 matching lines @@
     : RenderSVGResourceContainer(node)
 {
 }
 
 RenderSVGResourceMarker::~RenderSVGResourceMarker()
 {
 }
 
 void RenderSVGResourceMarker::layout()
 {
-    StackStats::LayoutCheckPoint layoutCheckPoint;
     // Invalidate all resources if our layout changed.
     if (everHadLayout() && selfNeedsLayout())
         RenderSVGRoot::addResourceForClientInvalidation(this);
 
     // RenderSVGHiddenContainer overwrites layout(). We need the
     // layouting of RenderSVGContainer for calculating  local
     // transformations and repaint.
     RenderSVGContainer::layout();
 }
 
@@ skipping 111 matching lines @@
     SVGMarkerElement* marker = toSVGMarkerElement(node());
     ASSERT(marker);
 
     SVGLengthContext lengthContext(marker);
     float w = marker->markerWidthCurrentValue().value(lengthContext);
     float h = marker->markerHeightCurrentValue().value(lengthContext);
     m_viewport = FloatRect(0, 0, w, h);
 }
 
 }