Fix Range.createContextualFragment for non-Element contexts.

Source/core/html/HTMLDocument.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009 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 65 matching lines @@
 
     using Document::write;
     using Document::writeln;
     void write(DOMWindow*, const Vector<String>& text);
     void writeln(DOMWindow*, const Vector<String>& text);
 
     static bool isCaseSensitiveAttribute(const QualifiedName&);
 
     virtual PassRefPtr<Document> cloneDocumentWithoutChildren() OVERRIDE FINAL;
 
+    HTMLBodyElement* htmlBodyElement() const;
+
 protected:
     HTMLDocument(const DocumentInit&, DocumentClassFlags extendedDocumentClasses = DefaultDocumentClass);
 
 private:
-    HTMLBodyElement* htmlBodyElement() const;
-
     const AtomicString& bodyAttributeValue(const QualifiedName&) const;
     void setBodyAttribute(const QualifiedName&, const AtomicString&);
 
     void addItemToMap(HashCountedSet<AtomicString>&, const AtomicString&);
     void removeItemFromMap(HashCountedSet<AtomicString>&, const AtomicString&);
 
     HashCountedSet<AtomicString> m_namedItemCounts;
     HashCountedSet<AtomicString> m_extraNamedItemCounts;
 };
 
 inline bool HTMLDocument::hasNamedItem(const AtomicString& name)
 {
     return m_namedItemCounts.contains(name);
 }
 
 inline bool HTMLDocument::hasExtraNamedItem(const AtomicString& name)
 {
     return m_extraNamedItemCounts.contains(name);
 }
 
 DEFINE_DOCUMENT_TYPE_CASTS(HTMLDocument);
 
 } // namespace WebCore
 
 #endif // HTMLDocument_h