It was never used (verified by eyeballing `git log -p` all the way
down), we don't seem to know what it's for, and it has no counterpart in
the structs.

This is in preparation for moving to `controller-gen`, which is somewhat
opinionated in that it does not allow us to pick the exact file names.

I guess we do not really care what these are called anyway - the only
place where these names show up is this integration test.