Refcount IFGAS_ streams all the time, too

xfa/fxfa/parser/cxfa_widetextread.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_WIDETEXTREAD_H_
 #define XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_
 
 #include "xfa/fgas/crt/fgas_stream.h"
 
 class CXFA_WideTextRead : public IFGAS_Stream {
  public:
   explicit CXFA_WideTextRead(const CFX_WideString& wsBuffer);
 
   // IFGAS_Stream
-  void Release() override;
-  IFGAS_Stream* Retain() override;
   uint32_t GetAccessModes() const override;
   int32_t GetLength() const override;
   int32_t Seek(FX_STREAMSEEK eSeek, int32_t iOffset) override;
   int32_t GetPosition() override;
   bool IsEOF() const override;
   int32_t ReadData(uint8_t* pBuffer, int32_t iBufferSize) override;
   int32_t ReadString(FX_WCHAR* pStr, int32_t iMaxLength, bool& bEOS) override;
   int32_t WriteData(const uint8_t* pBuffer, int32_t iBufferSize) override;
   int32_t WriteString(const FX_WCHAR* pStr, int32_t iLength) override;
   void Flush() override {}
   bool SetLength(int32_t iLength) override;
   int32_t GetBOM(uint8_t bom[4]) const override;
   uint16_t GetCodePage() const override;
   uint16_t SetCodePage(uint16_t wCodePage) override;
-  IFGAS_Stream* CreateSharedStream(uint32_t dwAccess,
-                                   int32_t iOffset,
-                                   int32_t iLength) override;
+  CFX_RetainPtr<IFGAS_Stream> CreateSharedStream(uint32_t dwAccess,
+                                                 int32_t iOffset,
+                                                 int32_t iLength) override;
 
   CFX_WideString GetSrcText() const;
 
  protected:
   CFX_WideString m_wsBuffer;
   int32_t m_iPosition;
-  int32_t m_iRefCount;
 };
 
 #endif  // XFA_FXFA_PARSER_CXFA_WIDETEXTREAD_H_