Remove unneeded helper.

Change-Id: I2e5c64244b5b0371b18a40381d89ade78d6a8720
Remove redundant members of the PatchSet tuple

Change-Id: I4ce467f437ca091a067420d758584fcd70480b85
Pick up fixes to gerritbot so that its tests pass

Change-Id: Id755968453253a4134e1b86404aa00700cc1c538