Remove Usage of -[FBTask completed] in FBMacDevice
Remove Usage of -[FBTask completed] in FBMacDevice

Summary: Another example where we can be explicit about app termination

Reviewed By: jamescoggan

Differential Revision: D30189545

fbshipit-source-id: a44a83e95a95dfb0f0796f12ff4431673f045a99

facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl,facebook/FBSimulatorControl