Constify the rendering/ selection code

Source/core/rendering/InlineFlowBox.cpp

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1429 matching lines @@
 }
 
 InlineBox* InlineFlowBox::lastLeafChild() const
 {
     InlineBox* leaf = 0;
     for (InlineBox* child = lastChild(); child && !leaf; child = child->prevOnLine())
         leaf = child->isLeaf() ? child : toInlineFlowBox(child)->lastLeafChild();
     return leaf;
 }
 
-RenderObject::SelectionState InlineFlowBox::selectionState()
+RenderObject::SelectionState InlineFlowBox::selectionState() const
 {
     return RenderObject::SelectionNone;
 }
 
 bool InlineFlowBox::canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const
 {
     for (InlineBox *box = firstChild(); box; box = box->nextOnLine()) {
         if (!box->canAccommodateEllipsis(ltr, blockEdge, ellipsisWidth))
             return false;
     }
@@ skipping 211 matching lines @@
         ASSERT(child->prevOnLine() == prev);
         prev = child;
     }
     ASSERT(prev == m_lastChild);
 #endif
 }
 
 #endif
 
 } // namespace blink