FPDF_Creator can only create file through embedder-supplied callback.

core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp

Index: core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
index 6f193071debfb189af9497de221c1325b04d2474..ff0539c61fb38c3cd3831e5dd389d932010f24d7 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_create.cpp
@@ -2016,26 +2016,6 @@ void CPDF_Creator::Clear() {
     m_pIDArray = NULL;
   }
 }
-FX_BOOL CPDF_Creator::Create(const FX_CHAR* filename, FX_DWORD flags) {
-  if (!m_File.AttachFile(filename)) {
-    return FALSE;
-  }
-  FX_BOOL bRet = Create(flags);
-  if (!bRet || !(flags & FPDFCREATE_PROGRESSIVE)) {
-    Clear();
-  }
-  return bRet;
-}
-FX_BOOL CPDF_Creator::Create(const FX_WCHAR* filename, FX_DWORD flags) {
-  if (!m_File.AttachFile(filename)) {
-    return FALSE;
-  }
-  FX_BOOL bRet = Create(flags);
-  if (!bRet || !(flags & FPDFCREATE_PROGRESSIVE)) {
-    Clear();
-  }
-  return bRet;
-}
 FX_BOOL CPDF_Creator::Create(IFX_StreamWrite* pFile, FX_DWORD flags) {
   if (!pFile) {
     return FALSE;