Refcount all the IFX_ stream classes all the time.

core/fxcodec/codec/fx_codec_tiff.cpp

Index: core/fxcodec/codec/fx_codec_tiff.cpp
diff --git a/core/fxcodec/codec/fx_codec_tiff.cpp b/core/fxcodec/codec/fx_codec_tiff.cpp
index 8046f1cc39c50de0a7c8fd1717d9ee70e2dc99aa..be9c7d447f1d1f6b8e00651aebb8c87fecf1a043 100644
--- a/core/fxcodec/codec/fx_codec_tiff.cpp
+++ b/core/fxcodec/codec/fx_codec_tiff.cpp
@@ -8,8 +8,10 @@
 
 #include "core/fxcodec/codec/codec_int.h"
 #include "core/fxcodec/fx_codec.h"
+#include "core/fxcrt/cfx_retain_ptr.h"
 #include "core/fxcrt/fx_safe_types.h"
 #include "core/fxge/fx_dib.h"
+#include "third_party/base/ptr_util.h"
 
 extern "C" {
 #include "third_party/libtiff/tiffiop.h"
@@ -20,7 +22,7 @@ class CCodec_TiffContext {
   CCodec_TiffContext();
   ~CCodec_TiffContext();
 
-  bool InitDecoder(IFX_SeekableReadStream* file_ptr);
+  bool InitDecoder(const CFX_RetainPtr<IFX_SeekableReadStream>& file_ptr);
   bool LoadFrameInfo(int32_t frame,
                      int32_t* width,
                      int32_t* height,
@@ -29,7 +31,7 @@ class CCodec_TiffContext {
                      CFX_DIBAttribute* pAttribute);
   bool Decode(CFX_DIBitmap* pDIBitmap);
 
-  IFX_SeekableReadStream* io_in() const { return m_io_in; }
+  CFX_RetainPtr<IFX_SeekableReadStream> io_in() const { return m_io_in; }
   uint32_t offset() const { return m_offset; }
   void set_offset(uint32_t offset) { m_offset = offset; }
 
@@ -52,7 +54,7 @@ class CCodec_TiffContext {
                       uint16_t bps,
                       uint16_t spp);
 
-  IFX_SeekableReadStream* m_io_in;
+  CFX_RetainPtr<IFX_SeekableReadStream> m_io_in;
   uint32_t m_offset;
   TIFF* m_tif_ctx;
 };
@@ -215,7 +217,8 @@ CCodec_TiffContext::~CCodec_TiffContext() {
     TIFFClose(m_tif_ctx);
 }
 
-bool CCodec_TiffContext::InitDecoder(IFX_SeekableReadStream* file_ptr) {
+bool CCodec_TiffContext::InitDecoder(
+    const CFX_RetainPtr<IFX_SeekableReadStream>& file_ptr) {
   m_io_in = file_ptr;
   m_tif_ctx = tiff_open(this, "r");
   return !!m_tif_ctx;
@@ -462,13 +465,12 @@ bool CCodec_TiffContext::Decode(CFX_DIBitmap* pDIBitmap) {
 }
 
 CCodec_TiffContext* CCodec_TiffModule::CreateDecoder(
-    IFX_SeekableReadStream* file_ptr) {
-  CCodec_TiffContext* pDecoder = new CCodec_TiffContext;
-  if (!pDecoder->InitDecoder(file_ptr)) {
-    delete pDecoder;
+    const CFX_RetainPtr<IFX_SeekableReadStream>& file_ptr) {
+  auto pDecoder = pdfium::MakeUnique<CCodec_TiffContext>();
+  if (!pDecoder->InitDecoder(file_ptr))
     return nullptr;
-  }
-  return pDecoder;
+
+  return pDecoder.release();
 }
 
 bool CCodec_TiffModule::LoadFrameInfo(CCodec_TiffContext* ctx,