Make supportsMarkers non virtual

Source/core/svg/SVGLineElement.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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,
@@ skipping 28 matching lines @@
 
 private:
     explicit SVGLineElement(Document&);
 
     virtual bool supportsFocus() const OVERRIDE { return hasFocusEventListeners(); }
 
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void svgAttributeChanged(const QualifiedName&) OVERRIDE;
 
-    virtual bool supportsMarkers() const OVERRIDE { return true; }
-
     virtual bool selfHasRelativeLengths() const OVERRIDE;
 
     RefPtr<SVGAnimatedLength> m_x1;
     RefPtr<SVGAnimatedLength> m_y1;
     RefPtr<SVGAnimatedLength> m_x2;
     RefPtr<SVGAnimatedLength> m_y2;
 };
 
 } // namespace WebCore
 
 #endif