Refcount IFGAS_ streams all the time, too

testing/libfuzzer/pdf_xml_fuzzer.cc

Index: testing/libfuzzer/pdf_xml_fuzzer.cc
diff --git a/testing/libfuzzer/pdf_xml_fuzzer.cc b/testing/libfuzzer/pdf_xml_fuzzer.cc
index d28522c2ea8b620b476d0012d68f809ed5e5e321..4f000ab78e8b6cf8385560767d97ea52ced77eb6 100644
--- a/testing/libfuzzer/pdf_xml_fuzzer.cc
+++ b/testing/libfuzzer/pdf_xml_fuzzer.cc
@@ -52,15 +52,13 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
 
   CFX_WideString input =
       CFX_WideString::FromUTF8(CFX_ByteStringC(data, safe_size.ValueOrDie()));
-  std::unique_ptr<IFGAS_Stream, ReleaseDeleter<IFGAS_Stream>> stream(
-      new CXFA_WideTextRead(input));
+  auto stream = pdfium::MakeRetain<CXFA_WideTextRead>(input);
   if (!stream)
     return 0;
 
   std::unique_ptr<CFDE_XMLDoc> doc = pdfium::MakeUnique<CFDE_XMLDoc>();
   std::unique_ptr<CFDE_XMLParser, ReleaseDeleter<CFDE_XMLParser>> parser(
-      new CXFA_XMLParser(doc->GetRoot(), stream.get()));
-
+      new CXFA_XMLParser(doc->GetRoot(), stream));
   if (!doc->LoadXML(parser.release()))
     return 0;