Rename IFX_ stream names

fpdfsdk/fpdfxfa/cpdfxfa_app.cpp

Index: fpdfsdk/fpdfxfa/cpdfxfa_app.cpp
diff --git a/fpdfsdk/fpdfxfa/cpdfxfa_app.cpp b/fpdfsdk/fpdfxfa/cpdfxfa_app.cpp
index 61694d0a289a30dd94f9c424554261cdbc3ea407..dc5c4be0d68b3f0932285f1b9f5094c545d2e0bb 100644
--- a/fpdfsdk/fpdfxfa/cpdfxfa_app.cpp
+++ b/fpdfsdk/fpdfxfa/cpdfxfa_app.cpp
@@ -187,7 +187,7 @@ CFX_WideString CPDFXFA_App::Response(const CFX_WideString& wsQuestion,
   return wsAnswer;
 }
 
-IFX_FileRead* CPDFXFA_App::DownloadURL(const CFX_WideString& wsURL) {
+IFX_SeekableReadStream* CPDFXFA_App::DownloadURL(const CFX_WideString& wsURL) {
   CPDFSDK_FormFillEnvironment* pFormFillEnv = m_pFormFillEnvList.GetAt(0);
   return pFormFillEnv ? pFormFillEnv->DownloadFromURL(wsURL.c_str()) : nullptr;
 }