Refcount all the IFX_ stream classes all the time.

core/fpdfapi/parser/fpdf_parser_utility.h

 // Copyright 2016 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 CORE_FPDFAPI_PARSER_FPDF_PARSER_UTILITY_H_
 #define CORE_FPDFAPI_PARSER_FPDF_PARSER_UTILITY_H_
 
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
 
 class IFX_SeekableReadStream;
 class CPDF_Dictionary;
 
 // Use the accessors below instead of directly accessing PDF_CharType.
 extern const char PDF_CharType[256];
 
 inline bool PDFCharIsWhitespace(uint8_t c) {
   return PDF_CharType[c] == 'W';
 }
 inline bool PDFCharIsNumeric(uint8_t c) {
   return PDF_CharType[c] == 'N';
 }
 inline bool PDFCharIsDelimiter(uint8_t c) {
   return PDF_CharType[c] == 'D';
 }
 inline bool PDFCharIsOther(uint8_t c) {
   return PDF_CharType[c] == 'R';
 }
 
 inline bool PDFCharIsLineEnding(uint8_t c) {
   return c == '\r' || c == '\n';
 }
 
-int32_t GetHeaderOffset(IFX_SeekableReadStream* pFile);
+int32_t GetHeaderOffset(const CFX_RetainPtr<IFX_SeekableReadStream>& pFile);
 int32_t GetDirectInteger(CPDF_Dictionary* pDict, const CFX_ByteString& key);
 
 #endif  // CORE_FPDFAPI_PARSER_FPDF_PARSER_UTILITY_H_