Reduce number of header includes in SVG

Source/core/svg/SVGURIReference.cpp

 /*
  * Copyright (C) 2004, 2005, 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.
  */
 
 #include "config.h"
 
 #include "core/svg/SVGURIReference.h"
 
+#include "XLinkNames.h"
 #include "core/dom/Document.h"
 #include "weborigin/KURL.h"
 
 namespace WebCore {
 
 bool SVGURIReference::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name.matches(XLinkNames::hrefAttr)) {
         setHrefBaseValue(value);
         return true;
@@ skipping 64 matching lines @@
 
     return document->getElementById(id);
 }
 
 void SVGURIReference::addSupportedAttributes(HashSet<QualifiedName>& supportedAttributes)
 {
     supportedAttributes.add(XLinkNames::hrefAttr);
 }
 
 }