Refcount IFGAS_ streams all the time, too

xfa/fde/cfde_txtedtengine.h

 // Copyright 2014 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_FDE_CFDE_TXTEDTENGINE_H_
 #define XFA_FDE_CFDE_TXTEDTENGINE_H_
 
 #include <memory>
 
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "xfa/fde/ifde_txtedtengine.h"
 
 class CFDE_TxtEdtBuf;
 class CFDE_TxtEdtParag;
 class CFX_TxtBreak;
 class IFDE_TxtEdtDoRecord;
 class IFX_CharIter;
 
 class CFDE_TxtEdtEngine {
  public:
   CFDE_TxtEdtEngine();
   ~CFDE_TxtEdtEngine();
 
   void SetEditParams(const FDE_TXTEDTPARAMS& params);
   FDE_TXTEDTPARAMS* GetEditParams();
 
   int32_t CountPages() const;
   IFDE_TxtEdtPage* GetPage(int32_t nIndex);
 
-  void SetTextByStream(IFGAS_Stream* pStream);
+  void SetTextByStream(const CFX_RetainPtr<IFGAS_Stream>& pStream);
   void SetText(const CFX_WideString& wsText);
   int32_t GetTextLength() const;
   CFX_WideString GetText(int32_t nStart, int32_t nCount = -1) const;
   void ClearText();
 
   int32_t GetCaretRect(CFX_RectF& rtCaret) const;
   int32_t GetCaretPos() const;
   int32_t SetCaretPos(int32_t nIndex, bool bBefore);
   int32_t MoveCaretPos(FDE_TXTEDTMOVECARET eMoveCaret,
                        bool bShift = false,
@@ skipping 123 matching lines @@
   bool m_bLock;
   int32_t m_nLimit;
   FX_WCHAR m_wcAliasChar;
   int32_t m_nFirstLineEnd;
   bool m_bAutoLineEnd;
   FX_WCHAR m_wLineEnd;
   FDE_TXTEDT_TEXTCHANGE_INFO m_ChangeInfo;
 };
 
 #endif  // XFA_FDE_CFDE_TXTEDTENGINE_H_