Convert DocumentParser code to Use more reference

Source/core/html/parser/HTMLDocumentParser.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 50 matching lines @@
 class HTMLTreeBuilder;
 class HTMLResourcePreloader;
 class ScriptController;
 class ScriptSourceCode;
 
 class PumpSession;
 
 class HTMLDocumentParser :  public ScriptableDocumentParser, HTMLScriptRunnerHost, ResourceClient {
     WTF_MAKE_FAST_ALLOCATED;
 public:
-    static PassRefPtr<HTMLDocumentParser> create(HTMLDocument* document, bool reportErrors)
+    static PassRefPtr<HTMLDocumentParser> create(HTMLDocument& document, bool reportErrors)
     {
         return adoptRef(new HTMLDocumentParser(document, reportErrors));
     }
     virtual ~HTMLDocumentParser();
 
     // Exposed for HTMLParserScheduler
     void resumeParsingAfterYield();
 
     static void parseDocumentFragment(const String&, DocumentFragment*, Element* contextElement, ParserContentPolicy = AllowScriptingContent);
 
@@ skipping 21 matching lines @@
     virtual void flush() OVERRIDE FINAL;
     virtual void setDecoder(PassOwnPtr<TextResourceDecoder>) OVERRIDE FINAL;
 
     UseCounter* useCounter() { return UseCounter::getFrom(contextForParsingSession()); }
 
 protected:
     virtual void insert(const SegmentedString&) OVERRIDE FINAL;
     virtual void append(PassRefPtr<StringImpl>) OVERRIDE;
     virtual void finish() OVERRIDE FINAL;
 
-    HTMLDocumentParser(HTMLDocument*, bool reportErrors);
+    HTMLDocumentParser(HTMLDocument&, bool reportErrors);
     HTMLDocumentParser(DocumentFragment*, Element* contextElement, ParserContentPolicy);
 
     HTMLTreeBuilder* treeBuilder() const { return m_treeBuilder.get(); }
 
     void forcePlaintextForTextDocument();
 
 private:
     static PassRefPtr<HTMLDocumentParser> create(DocumentFragment* fragment, Element* contextElement, ParserContentPolicy parserContentPolicy)
     {
         return adoptRef(new HTMLDocumentParser(fragment, contextElement, parserContentPolicy));
@@ skipping 81 matching lines @@
 
     bool m_isPinnedToMainThread;
     bool m_endWasDelayed;
     bool m_haveBackgroundParser;
     unsigned m_pumpSessionNestingLevel;
 };
 
 }
 
 #endif