SVGLangSpace interface should be removed

Source/core/svg/SVGLangSpace.h

-/*
- * Copyright (C) 2004, 2005, 2007, 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,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB.  If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- */
-
-#ifndef SVGLangSpace_h
-#define SVGLangSpace_h
-
-#include "core/dom/QualifiedName.h"
-#include "wtf/HashSet.h"
-
-namespace WebCore {
-
-class Attribute;
-
-class SVGLangSpace {
-public:
-    const AtomicString& xmllang() const { return m_lang; }
-    void setXMLlang(const AtomicString& xmlLang);
-
-    const AtomicString& xmlspace() const;
-    void setXMLspace(const AtomicString& xmlSpace);
-
-    bool parseAttribute(const QualifiedName&, const AtomicString&);
-    bool isKnownAttribute(const QualifiedName&);
-    void addSupportedAttributes(HashSet<QualifiedName>&);
-
-private:
-    AtomicString m_lang;
-    AtomicString m_space;
-};
-
-} // namespace WebCore
-
-#endif // SVGLangSpace_h