Demistify DocumentParser::append

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 80 matching lines @@
 
     String remainingData = m_decoder->flush();
     updateDocument(remainingData);
 }
 
 void DecodedDataDocumentParser::updateDocument(String& decodedData)
 {
     document()->setEncodingData(DocumentEncodingData(*m_decoder.get()));
 
     if (!decodedData.isEmpty())
-        append(decodedData.releaseImpl());
+        append(decodedData);
 }
 
 };