Revert the changes that fetch the file id in the propagator.

We don't want to fetch the file id in the propagator.

Revert "Put item member variable to base class."
This reverts commit f7aa2aa348c098eb36929d5100f3364851c1e969.

Revert "Add isValidFileId and getFileIdPropget methods."
This reverts commit ccd254abba320d971f297f71f3158b37ac6071af.