Convert XMLDocumentParser code to Use more reference

Source/core/dom/DecodedDataDocumentParser.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/dom/DecodedDataDocumentParser.h"
 
 #include "core/dom/Document.h"
 #include "core/dom/DocumentEncodingData.h"
 #include "core/html/parser/TextResourceDecoder.h"
 
 namespace WebCore {
 
-DecodedDataDocumentParser::DecodedDataDocumentParser(Document* document)
-    : DocumentParser(document)
+DecodedDataDocumentParser::DecodedDataDocumentParser(Document& document)
+    : DocumentParser(&document)
     , m_needsDecoder(true)
 {
 }
 
 DecodedDataDocumentParser::~DecodedDataDocumentParser()
 {
 }
 
 void DecodedDataDocumentParser::setDecoder(PassOwnPtr<TextResourceDecoder> decoder)
 {
@@ skipping 48 matching lines @@
 
 void DecodedDataDocumentParser::updateDocument(String& decodedData)
 {
     document()->setEncodingData(DocumentEncodingData(*m_decoder.get()));
 
     if (!decodedData.isEmpty())
         append(decodedData.releaseImpl());
 }
 
 };