Refcount all the IFX_ stream classes all the time.

xfa/fxfa/fm2js/xfa_fm2jscontext.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/fxfa/fm2js/xfa_fm2jscontext.h"
 
 #include <time.h>
 
@@ skipping 4906 matching lines @@
   if (!pDoc)
     return;
 
   IXFA_AppProvider* pAppProvider = pDoc->GetNotify()->GetAppProvider();
   if (!pAppProvider)
     return;
 
   std::unique_ptr<CFXJSE_Value> argOne = GetSimpleValue(pThis, args, 0);
   CFX_ByteString urlString;
   ValueToUTF8String(argOne.get(), urlString);
-  IFX_SeekableReadStream* pFile = pAppProvider->DownloadURL(
+  CFX_RetainPtr<IFX_SeekableReadStream> pFile = pAppProvider->DownloadURL(
       CFX_WideString::FromUTF8(urlString.AsStringC()));
   if (!pFile)
     return;
 
   int32_t size = pFile->GetSize();
   std::unique_ptr<uint8_t> pData(FX_Alloc(uint8_t, size));
   pFile->ReadBlock(pData.get(), size);
   args.GetReturnValue()->SetString(CFX_ByteStringC(pData.get(), size));
-  pFile->Release();
 }
 
 // static
 void CXFA_FM2JSContext::Post(CFXJSE_Value* pThis,
                              const CFX_ByteStringC& szFuncName,
                              CFXJSE_Arguments& args) {
   CXFA_FM2JSContext* pContext = ToJSContext(pThis, nullptr);
   int32_t argc = args.GetLength();
   if (argc < 2 || argc > 5) {
     pContext->ThrowException(XFA_IDS_INCORRECT_NUMBER_OF_METHOD, L"Post");
@@ skipping 1569 matching lines @@
   CFX_WideString wsFormat;
   pAppProvider->LoadString(iStringID, wsFormat);
   CFX_WideString wsMessage;
   va_list arg_ptr;
   va_start(arg_ptr, iStringID);
   wsMessage.FormatV(wsFormat.c_str(), arg_ptr);
   va_end(arg_ptr);
   FXJSE_ThrowMessage(
       FX_UTF8Encode(wsMessage.c_str(), wsMessage.GetLength()).AsStringC());
 }