message: Remove Realm::file_format_upgraded_from_version() from header
  The function was deleted in but the declaration was orphaned in the header.
diff: @@ -421,9 +421,6 @@ public:
  */
  static void delete_files(const std::string& realm_file_path, bool* did_delete_realm = nullptr);
  - // returns the file format version upgraded from if an upgrade took place
  - util::Optional<int> file_format_upgraded_from_version() const;
  -
  bool has_pending_async_work() const;
  Realm(const Realm&) = delete;
  