Remove StackStats.

Source/core/rendering/RenderRegion.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 259 matching lines @@
 
     checkRegionStyle();
     updateRegionHasAutoLogicalHeightFlag();
 
     if (oldStyle && oldStyle->writingMode() != style()->writingMode())
         m_flowThread->regionChangedWritingMode(this);
 }
 
 void RenderRegion::layoutBlock(bool relayoutChildren, LayoutUnit)
 {
-    StackStats::LayoutCheckPoint layoutCheckPoint;
     RenderBlock::layoutBlock(relayoutChildren);
 
     if (isValid()) {
         LayoutRect oldRegionRect(flowThreadPortionRect());
         if (!isHorizontalWritingMode())
             oldRegionRect = oldRegionRect.transposedRect();
 
         if (hasAutoLogicalHeight() && !m_flowThread->inConstrainedLayoutPhase()) {
             m_flowThread->invalidateRegions();
             clearComputedAutoHeight();
@@ skipping 354 matching lines @@
 
     LayoutUnit autoHeight = hasOverrideHeight() ? overrideLogicalContentHeight() : computedAutoHeight();
 
     LayoutUnit newLogicalHeight = autoHeight + borderAndPaddingLogicalHeight();
     ASSERT(newLogicalHeight < LayoutUnit::max() / 2);
     if (newLogicalHeight > logicalHeight())
         setLogicalHeight(newLogicalHeight);
 }
 
 } // namespace WebCore