[SVG Fonts] Fix <font-face> element leak document

Source/core/svg/SVGFontFaceElement.h

 /*
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2008 Apple Inc. 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.
  *
  * 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 SVGFontFaceElement_h
 #define SVGFontFaceElement_h
 
 #if ENABLE(SVG_FONTS)
 #include "SVGNames.h"
 #include "core/svg/SVGElement.h"
+#include "wtf/WeakPtr.h"
 
 namespace WebCore {
 
 class SVGFontElement;
+class SVGFontData;
 class StyleRuleFontFace;
 
 class SVGFontFaceElement FINAL : public SVGElement {
 public:
     static PassRefPtr<SVGFontFaceElement> create(Document&);
 
     unsigned unitsPerEm() const;
     int xHeight() const;
     float horizontalOriginX() const;
     float horizontalOriginY() const;
     float horizontalAdvanceX() const;
     float verticalOriginX() const;
     float verticalOriginY() const;
     float verticalAdvanceY() const;
     int ascent() const;
     int descent() const;
     String fontFamily() const;
 
     SVGFontElement* associatedFontElement() const;
     void rebuildFontFace();
 
     StyleRuleFontFace* fontFaceRule() const { return m_fontFaceRule.get(); }
+    WeakPtr<SVGFontFaceElement> createWeakRef() { return m_weakFactory.createWeakPtr(); }
 
 private:
     explicit SVGFontFaceElement(Document&);
 
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
 
     virtual void childrenChanged(bool changedByParser = false, Node* beforeChange = 0, Node* afterChange = 0, int childCountDelta = 0) OVERRIDE;
     virtual InsertionNotificationRequest insertedInto(ContainerNode*) OVERRIDE;
     virtual void removedFrom(ContainerNode*) OVERRIDE;
 
     virtual bool rendererIsNeeded(const RenderStyle&) OVERRIDE { return false; }
 
     RefPtrWillBePersistent<StyleRuleFontFace> m_fontFaceRule;
     SVGFontElement* m_fontElement;
+    WeakPtrFactory<SVGFontFaceElement> m_weakFactory;
 };
 
 } // namespace WebCore
 
 #endif // ENABLE(SVG_FONTS)
 #endif
 
 // vim:ts=4:noet