Refcount all the IFX_ stream classes all the time.

core/fpdfapi/edit/fpdf_edit_create.cpp

Index: core/fpdfapi/edit/fpdf_edit_create.cpp
diff --git a/core/fpdfapi/edit/fpdf_edit_create.cpp b/core/fpdfapi/edit/fpdf_edit_create.cpp
index b8757ae90382dcb78af65955f4b5d68e4a9b0230..62314f43f55a165ca29aff11d55a85f87dbd3b7e 100644
--- a/core/fpdfapi/edit/fpdf_edit_create.cpp
+++ b/core/fpdfapi/edit/fpdf_edit_create.cpp
@@ -1479,7 +1479,8 @@ int32_t CPDF_Creator::WriteDoc_Stage1(IFX_Pause* pPause) {
       InitOldObjNumOffsets();
       m_iStage = 20;
     } else {
-      IFX_SeekableReadStream* pSrcFile = m_pParser->GetFileAccess();
+      CFX_RetainPtr<IFX_SeekableReadStream> pSrcFile =
+          m_pParser->GetFileAccess();
       m_Offset = pSrcFile->GetSize();
       m_Pos = (void*)(uintptr_t)m_Offset;
       m_iStage = 15;
@@ -1487,8 +1488,9 @@ int32_t CPDF_Creator::WriteDoc_Stage1(IFX_Pause* pPause) {
   }
   if (m_iStage == 15) {
     if ((m_dwFlags & FPDFCREATE_NO_ORIGINAL) == 0 && m_Pos) {
-      IFX_SeekableReadStream* pSrcFile = m_pParser->GetFileAccess();
-      uint8_t buffer[4096];
+      CFX_RetainPtr<IFX_SeekableReadStream> pSrcFile =
+          m_pParser->GetFileAccess();
+      uint8_t buffer[4096];  // TODO(tsepez): don't stack allocate.
       uint32_t src_size = (uint32_t)(uintptr_t)m_Pos;
       while (src_size) {
         uint32_t block_size = src_size > 4096 ? 4096 : src_size;
@@ -1904,7 +1906,8 @@ void CPDF_Creator::Clear() {
   m_pIDArray.reset();
 }
 
-bool CPDF_Creator::Create(IFX_WriteStream* pFile, uint32_t flags) {
+bool CPDF_Creator::Create(const CFX_RetainPtr<IFX_WriteStream>& pFile,
+                          uint32_t flags) {
   m_File.AttachFile(pFile);
   return Create(flags);
 }