Refcount IFGAS_ streams all the time, too

xfa/fde/cfde_txtedtengine.cpp

 // 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
 
 #include "xfa/fde/cfde_txtedtengine.h"
 
 #include <algorithm>
 
@@ skipping 89 matching lines @@
   return ((m_nLineCount - 1) / m_nPageLineCount) + 1;
 }
 
 IFDE_TxtEdtPage* CFDE_TxtEdtEngine::GetPage(int32_t nIndex) {
   if (m_PagePtrArray.GetSize() <= nIndex) {
     return nullptr;
   }
   return m_PagePtrArray[nIndex];
 }
 
-void CFDE_TxtEdtEngine::SetTextByStream(IFGAS_Stream* pStream) {
+void CFDE_TxtEdtEngine::SetTextByStream(
+    const CFX_RetainPtr<IFGAS_Stream>& pStream) {
   ResetEngine();
   int32_t nIndex = 0;
   if (pStream && pStream->GetLength()) {
     int32_t nStreamLength = pStream->GetLength();
     bool bValid = true;
     if (m_nLimit > 0 && nStreamLength > m_nLimit) {
       bValid = false;
     }
     bool bPreIsCR = false;
     if (bValid) {
@@ skipping 1495 matching lines @@
       m_SelRangePtrArr.RemoveAt(nCountRange);
       DeleteRange_DoRecord(nSelStart, nSelCount, true);
     }
     ClearSelection();
     m_Param.pEventSink->On_TextChanged(this, m_ChangeInfo);
     m_Param.pEventSink->On_SelChanged(this);
     SetCaretPos(nSelStart, true);
     return;
   }
 }