Refcount IFGAS_ streams all the time, too

testing/libfuzzer/pdf_cfx_saxreader_fuzzer.cc

Index: testing/libfuzzer/pdf_cfx_saxreader_fuzzer.cc
diff --git a/testing/libfuzzer/pdf_cfx_saxreader_fuzzer.cc b/testing/libfuzzer/pdf_cfx_saxreader_fuzzer.cc
index 94decbfc2c58c4d4819584a0e061c6fa6219cee0..d99457d360f948e2d3238a851e6127103f786822 100644
--- a/testing/libfuzzer/pdf_cfx_saxreader_fuzzer.cc
+++ b/testing/libfuzzer/pdf_cfx_saxreader_fuzzer.cc
@@ -4,6 +4,7 @@
 
 #include <memory>
 
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "xfa/fde/xml/cfx_saxreader.h"
 #include "xfa/fgas/crt/fgas_stream.h"
 #include "xfa/fxfa/parser/cxfa_widetextread.h"
@@ -11,8 +12,7 @@
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
   CFX_WideString input = CFX_WideString::FromUTF8(
       CFX_ByteStringC(data, static_cast<FX_STRSIZE>(size)));
-  std::unique_ptr<IFGAS_Stream, ReleaseDeleter<IFGAS_Stream>> stream(
-      new CXFA_WideTextRead(input));
+  auto stream = pdfium::MakeRetain<CXFA_WideTextRead>(input);
   if (!stream)
     return 0;