We were previously using the set of deviceTokens returned by rescindPushNotifs(...) in rescindAndUpdateBadgeCounts to skip updateBadgeCount(...) for devices that had notifications rescinded. See D5606 for context.
Basically, we don't need the set of deviceTokens in rescindAndUpdateBadgeCounts and it isn't used anywhere else so it can be removed.
Depends on D5606