Bug 1064263 - Part 0: cleanup. r=me, a=lsblakk
Bug 1064263 - Part 1: avoid crash when Sync is partially configured. r=nalexander, a=lsblakk
Bug 1078395 - Work around missing profile in RestrictedProfiles. r=mfinkle, a=lsblakk

This is a partial fix; it avoids a crash, but isn't necessarily correct.
Bug 1092409 - Enable share overlay in release channels. r=trivial, a=lsblakk