Use unique_ptr for CXFA_XMLParser.

testing/libfuzzer/pdf_xml_fuzzer.cc

 // Copyright 2016 The 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.
 
 #include <cstddef>
 #include <cstdint>
 #include <memory>
 
 #include "core/fxcrt/fx_basic.h"
 #include "core/fxcrt/fx_safe_types.h"
@@ skipping 38 matching lines @@
   FX_SAFE_STRSIZE safe_size = size;
   if (!safe_size.IsValid())
     return 0;
 
   CFX_WideString input =
       CFX_WideString::FromUTF8(CFX_ByteStringC(data, safe_size.ValueOrDie()));
   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));
-  if (!doc->LoadXML(parser.release()))
+  auto doc = pdfium::MakeUnique<CFDE_XMLDoc>();
+  if (!doc->LoadXML(pdfium::MakeUnique<CXFA_XMLParser>(doc->GetRoot(), stream)))
     return 0;
 
-  int32_t load_result = doc->DoLoad(nullptr);
-  if (load_result < 100)
+  if (doc->DoLoad(nullptr) < 100)
     return 0;
 
   (void)XFA_FDEExtension_GetDocumentNode(doc.get());
   return 0;
 }