Constify the rendering/ selection code

Source/core/rendering/InlineFlowBox.h

 /*
  * Copyright (C) 2003, 2004, 2005, 2006, 2007 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 183 matching lines @@
     void flipLinesInBlockDirection(LayoutUnit lineTop, LayoutUnit lineBottom);
     bool requiresIdeographicBaseline(const GlyphOverflowAndFallbackFontsMap&) const;
 
     LayoutUnit computeOverAnnotationAdjustment(LayoutUnit allowedPosition) const;
     LayoutUnit computeUnderAnnotationAdjustment(LayoutUnit allowedPosition) const;
 
     void computeOverflow(LayoutUnit lineTop, LayoutUnit lineBottom, GlyphOverflowAndFallbackFontsMap&);
 
     void removeChild(InlineBox* child, MarkLineBoxes);
 
-    virtual RenderObject::SelectionState selectionState() OVERRIDE;
+    virtual RenderObject::SelectionState selectionState() const OVERRIDE;
 
     virtual bool canAccommodateEllipsis(bool ltr, int blockEdge, int ellipsisWidth) const OVERRIDE FINAL;
     virtual float placeEllipsisBox(bool ltr, float blockLeftEdge, float blockRightEdge, float ellipsisWidth, float &truncatedWidth, bool&) OVERRIDE;
 
     bool hasTextChildren() const { return m_hasTextChildren; }
     bool hasTextDescendants() const { return m_hasTextDescendants; }
     void setHasTextChildren() { m_hasTextChildren = true; setHasTextDescendants(); }
     void setHasTextDescendants() { m_hasTextDescendants = true; }
 
     void checkConsistency() const;
@@ skipping 161 matching lines @@
 }
 
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::InlineFlowBox*);
 #endif
 
 #endif // InlineFlowBox_h