Clear SVGInlineTextBox fragments when the text changes.

Source/core/rendering/svg/SVGRootInlineBox.h

Index: Source/core/rendering/svg/SVGRootInlineBox.h
diff --git a/Source/core/rendering/svg/SVGRootInlineBox.h b/Source/core/rendering/svg/SVGRootInlineBox.h
index 068033a0a8a97e0914224d733101af64ac927463..0456d899c0a2c40b6bce2670fcb7bb2bb2dcc51f 100644
--- a/Source/core/rendering/svg/SVGRootInlineBox.h
+++ b/Source/core/rendering/svg/SVGRootInlineBox.h
@@ -40,18 +40,15 @@ public:
     {
     }
 
-    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: