Refcount IFGAS_ streams all the time, too

xfa/fxfa/parser/cxfa_dataexporter.h

 // 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
 
 #ifndef XFA_FXFA_PARSER_CXFA_DATAEXPORTER_H_
 #define XFA_FXFA_PARSER_CXFA_DATAEXPORTER_H_
 
 #include "core/fxcrt/cfx_retain_ptr.h"
 #include "core/fxcrt/fx_string.h"
 
 class CXFA_Document;
 class CXFA_Node;
 class IFX_SeekableWriteStream;
 class IFGAS_Stream;
 
 class CXFA_DataExporter {
  public:
   explicit CXFA_DataExporter(CXFA_Document* pDocument);
 
   bool Export(const CFX_RetainPtr<IFX_SeekableWriteStream>& pWrite);
   bool Export(const CFX_RetainPtr<IFX_SeekableWriteStream>& pWrite,
               CXFA_Node* pNode,
               uint32_t dwFlag,
               const FX_CHAR* pChecksum);
 
  protected:
-  bool Export(IFGAS_Stream* pStream,
+  bool Export(const CFX_RetainPtr<IFGAS_Stream>& pStream,
               CXFA_Node* pNode,
               uint32_t dwFlag,
               const FX_CHAR* pChecksum);
 
   CXFA_Document* const m_pDocument;
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_DATAEXPORTER_H_