Add toHTMLDocument() convenience methods that take a reference

Source/core/html/HTMLObjectElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Stefan Schimanski (1Stein@gmx.de)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 420 matching lines @@
             if (isRecognizedTagName(element->tagQName()) && !element->hasTagName(paramTag))
                 isNamedItem = false;
         } else if (child->isTextNode()) {
             if (!toText(child)->containsOnlyWhitespace())
                 isNamedItem = false;
         } else
             isNamedItem = false;
         child = child->nextSibling();
     }
     if (isNamedItem != wasNamedItem && document().isHTMLDocument()) {
-        HTMLDocument* document = toHTMLDocument(&this->document());
+        HTMLDocument& document = toHTMLDocument(this->document());
         if (isNamedItem) {
-            document->addNamedItem(getNameAttribute());
-            document->addExtraNamedItem(getIdAttribute());
+            document.addNamedItem(getNameAttribute());
+            document.addExtraNamedItem(getIdAttribute());
         } else {
-            document->removeNamedItem(getNameAttribute());
-            document->removeExtraNamedItem(getIdAttribute());
+            document.removeNamedItem(getNameAttribute());
+            document.removeExtraNamedItem(getIdAttribute());
         }
     }
     m_docNamedItem = isNamedItem;
 }
 
 bool HTMLObjectElement::containsJavaApplet() const
 {
     if (MIMETypeRegistry::isJavaAppletMIMEType(getAttribute(typeAttr)))
         return true;
 
@@ skipping 44 matching lines @@
     encoding.appendData(name(), value);
     return true;
 }
 
 HTMLFormElement* HTMLObjectElement::virtualForm() const
 {
     return FormAssociatedElement::form();
 }
 
 }