Bug 876458 - Fix MUnbox::congruentTo, r=jandem.
Bug 876382 - Fix OOM check in Ion code allocation of caches. r=h4writer
Bug 875367: Annotate ~280 more methods with MOZ_OVERRIDE in /layout. r=dholbert
Bug 875367 followup: Manually annotate ScrollSelectionIntoView and RepaintSelection in nsPresShell.h as MOZ_OVERRIDE. r=dholbert