Convert XMLDocumentParser code to Use more reference

Source/core/xml/parser/XMLDocumentParser.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008 Holger Hans Peter Freyther
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 721 matching lines @@
     return adoptRef(new XMLParserContext(parser));
 }
 
 // --------------------------------
 
 bool XMLDocumentParser::supportsXMLVersion(const String& version)
 {
     return version == "1.0";
 }
 
-XMLDocumentParser::XMLDocumentParser(Document* document, FrameView* frameView)
+XMLDocumentParser::XMLDocumentParser(Document& document, FrameView* frameView)
     : ScriptableDocumentParser(document)
     , m_view(frameView)
     , m_context(nullptr)
-    , m_currentNode(document)
+    , m_currentNode(&document)
     , m_isCurrentlyParsing8BitChunk(false)
     , m_sawError(false)
     , m_sawCSS(false)
     , m_sawXSLTransform(false)
     , m_sawFirstElement(false)
     , m_isXHTMLDocument(false)
     , m_parserPaused(false)
     , m_requestingScript(false)
     , m_finishCalled(false)
-    , m_xmlErrors(document)
+    , m_xmlErrors(&document)
     , m_pendingScript(0)
     , m_scriptStartPosition(TextPosition::belowRangePosition())
     , m_parsingFragment(false)
 {
     // This is XML being used as a document resource.
-    if (frameView && document->isXMLDocument())
-        UseCounter::count(*document, UseCounter::XMLDocument);
+    if (frameView && document.isXMLDocument())
+        UseCounter::count(document, UseCounter::XMLDocument);
 }
 
 XMLDocumentParser::XMLDocumentParser(DocumentFragment* fragment, Element* parentElement, ParserContentPolicy parserContentPolicy)
-    : ScriptableDocumentParser(&fragment->document(), parserContentPolicy)
+    : ScriptableDocumentParser(fragment->document(), parserContentPolicy)
     , m_view(0)
     , m_context(nullptr)
     , m_currentNode(fragment)
     , m_isCurrentlyParsing8BitChunk(false)
     , m_sawError(false)
     , m_sawCSS(false)
     , m_sawXSLTransform(false)
     , m_sawFirstElement(false)
     , m_isXHTMLDocument(false)
     , m_parserPaused(false)
@@ skipping 821 matching lines @@
     sax.initialized = XML_SAX2_MAGIC;
     RefPtr<XMLParserContext> parser = XMLParserContext::createStringParser(&sax, &state);
     String parseString = "<?xml version=\"1.0\"?><attrs " + string + " />";
     parseChunk(parser->context(), parseString);
     finishParsing(parser->context());
     attrsOK = state.gotAttributes;
     return state.attributes;
 }
 
 } // namespace WebCore