Backed out changeset 4bc1cf097ca1 (bug 952963)
Bug 952963 - Australis: areaType getter in widget wrapper shouldn't assume area exists, r=jaws
Fixing commit msg; DONTBUILD, identical to 4bc1cf097ca1
Bug 934951 - [Australis] Zoom controls percentage label doesn't update when it's in the toolbar and you navigate. r=mconley
Bug 956130 - [Australis] The tab groups button has the wrong icon when it is shown in non-overflow mode on Windows. r=mconley
Bug 956138 - [Australis] Have BrowserUITelemetry wait for sessionstore-windows-restored before gathering measurements. r=jaws.
Bug 951569 - Use text/plain for Send Tab intent handler. r=nalexander
Merge m-c to fx-team
merge fx-team to mozilla-central