Remove StackStats.

Source/core/rendering/RenderFlowThread.cpp

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above
  *    copyright notice, this list of conditions and the following
  *    disclaimer.
@@ skipping 175 matching lines @@
             }
         }
     }
 
     updateLogicalWidth(); // Called to get the maximum logical width for the region.
     updateRegionsFlowThreadPortionRect();
 }
 
 void RenderFlowThread::layout()
 {
-    StackStats::LayoutCheckPoint layoutCheckPoint;
-
     m_pageLogicalSizeChanged = m_regionsInvalidated && everHadLayout();
 
     // In case this is the second pass of the normal phase we need to update the auto-height regions to their initial value.
     // If the region chain was invalidated this will happen anyway.
     if (!m_regionsInvalidated && !inConstrainedLayoutPhase())
         initializeRegionsComputedAutoHeight();
 
     validateRegions();
 
     // This is the first phase of the layout and because we have auto-height regions we'll need a second
@@ skipping 835 matching lines @@
 {
     if (!m_renderFlowThread)
         return;
     RenderView* view = m_renderFlowThread->view();
     ASSERT(view->flowThreadController()->currentRenderFlowThread() == m_renderFlowThread);
     view->flowThreadController()->setCurrentRenderFlowThread(m_previousRenderFlowThread);
 }
 
 
 } // namespace WebCore