Fix crash in SVGFontFaceElement::associatedFontElement crash when removing SVGFontFaceElement.

Source/core/rendering/svg/RenderSVGText.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010-2012. 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 35 matching lines @@
 
     static RenderSVGText* locateRenderSVGTextAncestor(RenderObject*);
     static const RenderSVGText* locateRenderSVGTextAncestor(const RenderObject*);
 
     bool needsReordering() const { return m_needsReordering; }
     Vector<SVGTextLayoutAttributes*>& layoutAttributes() { return m_layoutAttributes; }
 
     void subtreeChildWasAdded(RenderObject*);
     void subtreeChildWillBeRemoved(RenderObject*, Vector<SVGTextLayoutAttributes*, 2>& affectedAttributes);
     void subtreeChildWasRemoved(const Vector<SVGTextLayoutAttributes*, 2>& affectedAttributes);
-    void subtreeStyleDidChange(RenderSVGInlineText*);
+    void subtreeStyleDidChange();
     void subtreeTextDidChange(RenderSVGInlineText*);
 
 private:
     virtual const char* renderName() const OVERRIDE { return "RenderSVGText"; }
     virtual bool isSVGText() const OVERRIDE { return true; }
 
     virtual void paint(PaintInfo&, const LayoutPoint&) OVERRIDE;
     virtual bool nodeAtFloatPoint(const HitTestRequest&, HitTestResult&, const FloatPoint& pointInParent, HitTestAction) OVERRIDE;
     virtual PositionWithAffinity positionForPoint(const LayoutPoint&) OVERRIDE;
 
@@ skipping 24 matching lines @@
     bool m_needsTextMetricsUpdate : 1;
     SVGTextLayoutAttributesBuilder m_layoutAttributesBuilder;
     Vector<SVGTextLayoutAttributes*> m_layoutAttributes;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGText, isSVGText());
 
 }
 
 #endif