Merge 99649

Source/WebCore/css/CSSFontFaceRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 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.
  *
@@ skipping 15 matching lines @@
 
 namespace WebCore {
 
 CSSFontFaceRule::CSSFontFaceRule(CSSStyleSheet* parent)
     : CSSRule(parent)
 {
 }
 
 CSSFontFaceRule::~CSSFontFaceRule()
 {
+    if (m_style)
+        m_style->setParentRule(0);
 }
 
 void CSSFontFaceRule::setDeclaration(PassRefPtr<CSSMutableStyleDeclaration> style)
 {
     m_style = style;
 }
 
 String CSSFontFaceRule::cssText() const
 {
     String result("@font-face");
     result += " { ";
     result += m_style->cssText();
     result += "}";
     return result;
 }
 
 void CSSFontFaceRule::addSubresourceStyleURLs(ListHashSet<KURL>& urls)
 {
     if (m_style)
         m_style->addSubresourceStyleURLs(urls);
 }
 
 } // namespace WebCore