Don't call ill-balanced removeStyleSheetCandidateNode()

Source/core/dom/StyleElement.h

 /*
  * Copyright (C) 2006, 2007 Rob Buis
  *
  * 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
@@ skipping 42 matching lines @@
     void childrenChanged(Element*);
     void finishParsingChildren(Element*);
 
     RefPtr<CSSStyleSheet> m_sheet;
 
 private:
     void createSheet(Element*, const String& text = String());
     void process(Element*);
     void clearSheet(Element* ownerElement = 0);
 
-    bool m_createdByParser;
-    bool m_loading;
+    bool m_createdByParser : 1;
+    bool m_loading : 1;
+    bool m_registeredAsCandidate : 1;
     TextPosition m_startPosition;
 };
 
 }
 
 #endif