Refcount all the IFX_ stream classes all the time.

xfa/fxfa/fxfa.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_FXFA_FXFA_H_
 #define XFA_FXFA_FXFA_H_
 
 #include <vector>
 
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "xfa/fxfa/fxfa_basic.h"
 #include "xfa/fxfa/fxfa_widget.h"
 
 class CFGAS_GEFont;
 class CFX_Graphics;
 class CPDF_Document;
 class CXFA_FFPageView;
 class CXFA_Node;
 class CXFA_NodeList;
 class CXFA_WidgetAcc;
@@ skipping 201 matching lines @@
   virtual CFX_WideString Response(const CFX_WideString& wsQuestion,
                                   const CFX_WideString& wsTitle = L"",
                                   const CFX_WideString& wsDefaultAnswer = L"",
                                   bool bMask = true) = 0;
 
   /**
    * Download something from somewhere.
    * @param[in] wsURL - http, ftp, such as
    * "http://www.w3.org/TR/REC-xml-names/".
    */
-  virtual IFX_SeekableReadStream* DownloadURL(const CFX_WideString& wsURL) = 0;
+  virtual CFX_RetainPtr<IFX_SeekableReadStream> DownloadURL(
+      const CFX_WideString& wsURL) = 0;
 
   /**
    * POST data to the given url.
    * @param[in] wsURL         the URL being uploaded.
    * @param[in] wsData        the data being uploaded.
    * @param[in] wsContentType the content type of data including text/html,
    * text/xml, text/plain, multipart/form-data,
    *                          application/x-www-form-urlencoded,
    * application/octet-stream, any valid MIME type.
    * @param[in] wsEncode      the encode of data including UTF-8, UTF-16,
@@ skipping 69 matching lines @@
                      uint32_t dwOptions) = 0;
   virtual FX_ARGB GetHighlightColor(CXFA_FFDoc* hDoc) = 0;
 
   virtual bool SubmitData(CXFA_FFDoc* hDoc, CXFA_Submit submit) = 0;
   virtual bool GetGlobalProperty(CXFA_FFDoc* hDoc,
                                  const CFX_ByteStringC& szPropName,
                                  CFXJSE_Value* pValue) = 0;
   virtual bool SetGlobalProperty(CXFA_FFDoc* hDoc,
                                  const CFX_ByteStringC& szPropName,
                                  CFXJSE_Value* pValue) = 0;
-  virtual IFX_SeekableReadStream* OpenLinkedFile(
+  virtual CFX_RetainPtr<IFX_SeekableReadStream> OpenLinkedFile(
       CXFA_FFDoc* hDoc,
       const CFX_WideString& wsLink) = 0;
 };
 
 class IXFA_WidgetIterator {
  public:
   virtual ~IXFA_WidgetIterator() {}
 
   virtual void Reset() = 0;
   virtual CXFA_FFWidget* MoveToFirst() = 0;
   virtual CXFA_FFWidget* MoveToLast() = 0;
   virtual CXFA_FFWidget* MoveToNext() = 0;
   virtual CXFA_FFWidget* MoveToPrevious() = 0;
   virtual CXFA_FFWidget* GetCurrentWidget() = 0;
   virtual bool SetCurrentWidget(CXFA_FFWidget* hWidget) = 0;
 };
 
 #endif  // XFA_FXFA_FXFA_H_