Constify the rendering/ selection code

Source/core/rendering/RenderText.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004-2009, 2013 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.
  *
@@ skipping 95 matching lines @@
     float firstRunX() const;
     float firstRunY() const;
 
     virtual void setText(PassRefPtr<StringImpl>, bool force = false);
     void setTextWithOffset(PassRefPtr<StringImpl>, unsigned offset, unsigned len, bool force = false);
 
     virtual void transformText();
 
     virtual bool canBeSelectionLeaf() const OVERRIDE { return true; }
     virtual void setSelectionState(SelectionState s) OVERRIDE FINAL;
-    virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, bool clipToVisibleContent = true) OVERRIDE;
+    virtual LayoutRect selectionRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, bool clipToVisibleContent = true) const OVERRIDE;
     virtual LayoutRect localCaretRect(InlineBox*, int caretOffset, LayoutUnit* extraWidthToEndOfLine = 0) OVERRIDE;
 
     LayoutUnit marginLeft() const { return minimumValueForLength(style()->marginLeft(), 0); }
     LayoutUnit marginRight() const { return minimumValueForLength(style()->marginRight(), 0); }
 
     virtual LayoutRect clippedOverflowRectForPaintInvalidation(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* = 0) const OVERRIDE FINAL;
     virtual const RenderLayerModelObject* containerForPaintInvalidation() const OVERRIDE;
 
     InlineTextBox* firstTextBox() const { return m_firstTextBox; }
     InlineTextBox* lastTextBox() const { return m_lastTextBox; }
@@ skipping 117 matching lines @@
 inline RenderText* Text::renderer() const
 {
     return toRenderText(CharacterData::renderer());
 }
 
 void applyTextTransform(const RenderStyle*, String&, UChar);
 
 } // namespace blink
 
 #endif // RenderText_h