Convert DocumentParser code to Use more reference

Source/core/html/parser/TextDocumentParser.cpp

 /*
  * 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 @@
 #include "config.h"
 #include "core/html/parser/TextDocumentParser.h"
 
 #include "HTMLNames.h"
 #include "core/html/parser/HTMLTreeBuilder.h"
 
 namespace WebCore {
 
 using namespace HTMLNames;
 
-TextDocumentParser::TextDocumentParser(HTMLDocument* document)
+TextDocumentParser::TextDocumentParser(HTMLDocument& document)
     : HTMLDocumentParser(document, false)
     , m_haveInsertedFakePreElement(false)
 {
 }
 
 TextDocumentParser::~TextDocumentParser()
 {
 }
 
 void TextDocumentParser::appendBytes(const char* data, size_t length)
@@ skipping 20 matching lines @@
     treeBuilder()->setShouldSkipLeadingNewline(false);
 
     // Although Text Documents expose a "pre" element in their DOM, they
     // act like a <plaintext> tag, so we have to force plaintext mode.
     forcePlaintextForTextDocument();
 
     m_haveInsertedFakePreElement = true;
 }
 
 }