Make MultiColumnFragmentainerGroup::m_columnSet const.

third_party/WebKit/Source/core/layout/LayoutMultiColumnSet.cpp

 /*
  * Copyright (C) 2012 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 295 matching lines @@
     if (m_oldLogicalTop != logicalTop() && multiColumnFlowThread()->enclosingFragmentationContext()) {
         // Preceding spanners or column sets have been moved or resized. This means that the
         // fragmentainer groups that we have inserted need to be re-inserted. Restart column
         // balancing.
         resetColumnHeight();
         return true;
     }
 
     bool changed = false;
     for (auto& group : m_fragmentainerGroups)
-        changed = group.recalculateColumnHeight() || changed;
+        changed = group.recalculateColumnHeight(*this) || changed;
     m_initialHeightCalculated = true;
     return changed;
 }
 
 void LayoutMultiColumnSet::resetColumnHeight()
 {
     m_fragmentainerGroups.deleteExtraGroups();
     m_fragmentainerGroups.first().resetColumnHeight();
     m_tallestUnbreakableLogicalHeight = LayoutUnit();
     m_initialHeightCalculated = false;
@@ skipping 140 matching lines @@
 
 LayoutRect LayoutMultiColumnSet::flowThreadPortionRect() const
 {
     LayoutRect portionRect(LayoutUnit(), logicalTopInFlowThread(), pageLogicalWidth(), logicalHeightInFlowThread());
     if (!isHorizontalWritingMode())
         return portionRect.transposedRect();
     return portionRect;
 }
 
 } // namespace blink