Bug 1017633 - Update "Clear history" dialog button and add telemetry. r=mfinkle
Bug 1017129 - Polish undo close tab button toast appearance. r=nalexander
Bug 1014957 - add telemetry probe to indicate if custom servers are used for sync. r=rnewman
Bug 1016924 - [appmgr v2] support non-device runtimes. r=ochameau
merge fx-team to mozilla-central