Change LayoutState to be stack-allocated

Source/core/rendering/RenderFlexibleBox.cpp

 /*
  * Copyright (C) 2011 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 224 matching lines @@
     LayoutRepainter repainter(*this, checkForPaintInvalidationDuringLayout());
 
     if (updateLogicalWidthAndColumnWidth())
         relayoutChildren = true;
 
     LayoutUnit previousHeight = logicalHeight();
     setLogicalHeight(borderAndPaddingLogicalHeight() + scrollbarLogicalHeight());
 
     {
         FastTextAutosizer::LayoutScope fastTextAutosizerLayoutScope(this);
-        LayoutStateMaintainer statePusher(*this, locationOffset());
+        LayoutState state(*this, locationOffset());
 
         m_numberOfInFlowChildrenOnFirstLine = -1;
 
         RenderBlock::startDelayUpdateScrollInfo();
 
         prepareOrderIteratorAndMargins();
 
         ChildFrameRects oldChildRects;
         appendChildFrameRects(oldChildRects);
 
@@ skipping 1160 matching lines @@
             ASSERT(child);
             LayoutUnit lineCrossAxisExtent = lineContexts[lineNumber].crossAxisExtent;
             LayoutUnit originalOffset = lineContexts[lineNumber].crossAxisOffset - crossAxisStartEdge;
             LayoutUnit newOffset = contentExtent - originalOffset - lineCrossAxisExtent;
             adjustAlignmentForChild(child, newOffset - originalOffset);
         }
     }
 }
 
 }