Remove column set range map from RenderFlowThread.

Source/core/rendering/RenderGrid.cpp

 /*
  * Copyright (C) 2011 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 327 matching lines @@
     layoutGridItems();
 
     LayoutUnit oldClientAfterEdge = clientLogicalBottom();
     updateLogicalHeight();
 
     if (size() != previousSize)
         relayoutChildren = true;
 
     layoutPositionedObjects(relayoutChildren || isDocumentElement());
 
-    computeRegionRangeForBlock(flowThreadContainingBlock());
-
     computeOverflow(oldClientAfterEdge);
 
     updateLayerTransformAfterLayout();
 
     // Update our scroll information if we're overflow:auto/scroll/hidden now that we know if
     // we overflow or not.
     if (hasOverflowClip())
         layer()->scrollableArea()->updateAfterLayout();
 
     clearNeedsLayout();
@@ skipping 1063 matching lines @@
     if (isOutOfFlowPositioned())
         return "RenderGrid (positioned)";
     if (isAnonymous())
         return "RenderGrid (generated)";
     if (isRelPositioned())
         return "RenderGrid (relative positioned)";
     return "RenderGrid";
 }
 
 } // namespace blink