This was created in Ic41cbe12 for the express purpose of deleting
changes and patch sets, when updates to the ReviewDb database happened
before updates to the Git storage. Deleting patch sets is no longer
possible, and now that we are NoteDb-only there is only a single
BatchRefUpdate and it doesn't matter what order we add commands to the
update. The only reason order might matter is if the BatchUpdateOp
implementation has internal state dependencies between stages.
DeleteChangeOp doesn't, therefore we can use the default order.
Change-Id: Ie15981b75de120752378cb610ed009f971533412
deb7e4d61f