Convert DocumentParser code to Use more reference

Source/core/html/parser/TextDocumentParser.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 14 matching lines @@
 
 #ifndef TextDocumentParser_h
 #define TextDocumentParser_h
 
 #include "core/html/parser/HTMLDocumentParser.h"
 
 namespace WebCore {
 
 class TextDocumentParser FINAL : public HTMLDocumentParser {
 public:
-    static PassRefPtr<TextDocumentParser> create(HTMLDocument* document)
+    static PassRefPtr<TextDocumentParser> create(HTMLDocument& document)
     {
         return adoptRef(new TextDocumentParser(document));
     }
     virtual ~TextDocumentParser();
 
 private:
-    explicit TextDocumentParser(HTMLDocument*);
+    explicit TextDocumentParser(HTMLDocument&);
 
     virtual void appendBytes(const char*, size_t) OVERRIDE;
     void insertFakePreElement();
 
     bool m_haveInsertedFakePreElement;
 };
 
 }
 
 #endif