Refcount all the IFX_ stream classes all the time.

core/fpdfapi/parser/cpdf_stream.h

Index: core/fpdfapi/parser/cpdf_stream.h
diff --git a/core/fpdfapi/parser/cpdf_stream.h b/core/fpdfapi/parser/cpdf_stream.h
index fb2b67cd82015cd8956939cd0816bd84c78e1d68..cd4113b22b6cd31697116d8b9f69c43c66a7fc93 100644
--- a/core/fpdfapi/parser/cpdf_stream.h
+++ b/core/fpdfapi/parser/cpdf_stream.h
@@ -43,7 +43,7 @@ class CPDF_Stream : public CPDF_Object {
   void InitStream(const uint8_t* pData,
                   uint32_t size,
                   std::unique_ptr<CPDF_Dictionary> pDict);
-  void InitStreamFromFile(IFX_SeekableReadStream* pFile,
+  void InitStreamFromFile(const CFX_RetainPtr<IFX_SeekableReadStream>& pFile,
                           std::unique_ptr<CPDF_Dictionary> pDict);
 
   bool ReadRawData(FX_FILESIZE start_pos,
@@ -62,7 +62,7 @@ class CPDF_Stream : public CPDF_Object {
   uint32_t m_dwSize = 0;
   std::unique_ptr<CPDF_Dictionary> m_pDict;
   std::unique_ptr<uint8_t, FxFreeDeleter> m_pDataBuf;
-  IFX_SeekableReadStream* m_pFile = nullptr;
+  CFX_RetainPtr<IFX_SeekableReadStream> m_pFile;
 };
 
 inline CPDF_Stream* ToStream(CPDF_Object* obj) {