Refcount IFGAS_ streams all the time, too

xfa/fxfa/parser/cxfa_xml_parser.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fxfa/parser/cxfa_xml_parser.h"
 
-CXFA_XMLParser::CXFA_XMLParser(CFDE_XMLNode* pRoot, IFGAS_Stream* pStream)
+CXFA_XMLParser::CXFA_XMLParser(CFDE_XMLNode* pRoot,
+                               const CFX_RetainPtr<IFGAS_Stream>& pStream)
     : m_nElementStart(0),
       m_dwCheckStatus(0),
       m_dwCurrentCheckStatus(0),
       m_pRoot(pRoot),
       m_pStream(pStream),
       m_pParser(new CFDE_XMLSyntaxParser),
       m_pParent(pRoot),
       m_pChild(nullptr),
       m_NodeStack(16),
       m_syntaxParserResult(FDE_XmlSyntaxResult::None) {
@@ skipping 147 matching lines @@
     }
     if (pPause && iCount > 500 && pPause->NeedToPauseNow()) {
       break;
     }
   }
   return (m_syntaxParserResult == FDE_XmlSyntaxResult::Error ||
           m_NodeStack.GetSize() != 1)
              ? -1
              : m_pParser->GetStatus();
 }