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

Source/core/rendering/svg/RenderSVGText.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010-2012. All rights reserved.
  * Copyright (C) 2012 Google Inc.
  *
@@ skipping 327 matching lines @@
             continue;
         RenderSVGInlineText* text = toRenderSVGInlineText(descendant);
         text->updateScaledFont();
         if (builder)
             builder->rebuildMetricsForTextRenderer(text);
     }
 }
 
 void RenderSVGText::layout()
 {
-    StackStats::LayoutCheckPoint layoutCheckPoint;
     ASSERT(needsLayout());
     LayoutRepainter repainter(*this, SVGRenderSupport::checkForSVGRepaintDuringLayout(this));
 
     bool updateCachedBoundariesInParents = false;
     if (m_needsTransformUpdate) {
         SVGTextElement* text = static_cast<SVGTextElement*>(node());
         m_localTransform = text->animatedLocalTransform();
         m_needsTransformUpdate = false;
         updateCachedBoundariesInParents = true;
     }
@@ skipping 194 matching lines @@
     return 0;
 }
 
 // Fix for <rdar://problem/8048875>. We should not render :first-letter CSS Style
 // in a SVG text element context.
 void RenderSVGText::updateFirstLetter()
 {
 }
 
 }