Convert XMLDocumentParser code to Use more reference

Source/core/xml/parser/XMLDocumentParser.h

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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 48 matching lines @@
         XMLParserContext(xmlParserCtxtPtr context)
             : m_context(context)
         {
         }
         xmlParserCtxtPtr m_context;
     };
 
     class XMLDocumentParser FINAL : public ScriptableDocumentParser, public ResourceClient {
         WTF_MAKE_FAST_ALLOCATED;
     public:
-        static PassRefPtr<XMLDocumentParser> create(Document* document, FrameView* view)
+        static PassRefPtr<XMLDocumentParser> create(Document& document, FrameView* view)
         {
             return adoptRef(new XMLDocumentParser(document, view));
         }
         static PassRefPtr<XMLDocumentParser> create(DocumentFragment* fragment, Element* element, ParserContentPolicy parserContentPolicy)
         {
             return adoptRef(new XMLDocumentParser(fragment, element, parserContentPolicy));
         }
 
         virtual ~XMLDocumentParser();
 
@@ skipping 14 matching lines @@
 
         static bool supportsXMLVersion(const String&);
 
         class PendingCallback {
         public:
             virtual ~PendingCallback() { }
             virtual void call(XMLDocumentParser*) = 0;
         };
 
     private:
-        XMLDocumentParser(Document*, FrameView* = 0);
+        explicit XMLDocumentParser(Document&, FrameView* = 0);
         XMLDocumentParser(DocumentFragment*, Element*, ParserContentPolicy);
 
         // From DocumentParser
         virtual void insert(const SegmentedString&) OVERRIDE;
         virtual void append(PassRefPtr<StringImpl>) OVERRIDE;
         virtual void finish() OVERRIDE;
         virtual bool isWaitingForScripts() const OVERRIDE;
         virtual void stopParsing() OVERRIDE;
         virtual void detach() OVERRIDE;
         virtual OrdinalNumber lineNumber() const OVERRIDE;
@@ skipping 76 matching lines @@
         SegmentedString m_pendingSrc;
     };
 
 xmlDocPtr xmlDocPtrForString(ResourceFetcher*, const String& source, const String& url);
 
 HashMap<String, String> parseAttributes(const String&, bool& attrsOK);
 
 } // namespace WebCore
 
 #endif // XMLDocumentParser_h