Change LayoutState to be stack-allocated

Source/core/rendering/RenderBlockFlow.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 331 matching lines @@
         relayoutChildren = true;
 
     rebuildFloatsFromIntruding();
 
     bool pageLogicalHeightChanged = false;
     bool hasSpecifiedPageLogicalHeight = false;
     checkForPaginationLogicalHeightChange(pageLogicalHeight, pageLogicalHeightChanged, hasSpecifiedPageLogicalHeight);
     if (pageLogicalHeightChanged)
         relayoutChildren = true;
 
-    LayoutStateMaintainer statePusher(*this, locationOffset(), pageLogicalHeight, pageLogicalHeightChanged, columnInfo());
+    LayoutState state(*this, locationOffset(), pageLogicalHeight, pageLogicalHeightChanged, columnInfo());
 
     // We use four values, maxTopPos, maxTopNeg, maxBottomPos, and maxBottomNeg, to track
     // our current maximal positive and negative margins. These values are used when we
     // are collapsed with adjacent blocks, so for example, if you have block A and B
     // collapsing together, then you'd take the maximal positive margin from both A and B
     // and subtract it from the maximal negative margin from both A and B to get the
     // true collapsed margin. This algorithm is recursive, so when we finish layout()
     // our block knows its current maximal positive/negative values.
     //
     // Start out by setting our margin values to our current margins. Table cells have
@@ skipping 2440 matching lines @@
 RenderBlockFlow::RenderBlockFlowRareData& RenderBlockFlow::ensureRareData()
 {
     if (m_rareData)
         return *m_rareData;
 
     m_rareData = adoptPtr(new RenderBlockFlowRareData(this));
     return *m_rareData;
 }
 
 } // namespace WebCore