Clear SVGInlineTextBox fragments when the text changes.

Source/core/rendering/svg/SVGRootInlineBox.h

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006 Apple Computer Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010. 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 22 matching lines @@
 class SVGInlineTextBox;
 
 class SVGRootInlineBox FINAL : public RootInlineBox {
 public:
     SVGRootInlineBox(RenderBlock* block)
         : RootInlineBox(block)
         , m_logicalHeight(0)
     {
     }
 
-    virtual bool isSVGRootInlineBox() const { return true; }
+    virtual bool isSVGRootInlineBox() const OVERRIDE FINAL { return true; }
 
-    virtual float virtualLogicalHeight() const { return m_logicalHeight; }
+    virtual float virtualLogicalHeight() const OVERRIDE FINAL { return m_logicalHeight; }
     void setLogicalHeight(float height) { m_logicalHeight = height; }
 
-    virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom);
+    virtual void paint(PaintInfo&, const LayoutPoint&, LayoutUnit lineTop, LayoutUnit lineBottom) OVERRIDE FINAL;
 
     void computePerCharacterLayoutInformation();
 
-    virtual FloatRect objectBoundingBox() const { return FloatRect(); }
-    virtual FloatRect repaintRectInLocalCoordinates() const { return FloatRect(); }
-
     InlineBox* closestLeafChildForPosition(const LayoutPoint&);
 
 private:
     void reorderValueLists(Vector<SVGTextLayoutAttributes*>&);
     void layoutCharactersInTextBoxes(InlineFlowBox*, SVGTextLayoutEngine&);
     void layoutChildBoxes(InlineFlowBox*, FloatRect* = 0);
     void layoutRootBox(const FloatRect&);
 
 private:
     float m_logicalHeight;
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG)
 
 #endif // SVGRootInlineBox_h