Make FBTaskProcess a Protocol
Make FBTaskProcess a Protocol

Summary: There's no need for this to be an abstract class since there is no benefit of shared behaviour

Reviewed By: antiarchit

Differential Revision: D5547789

fbshipit-source-id: 548dad830bc97e41c7719a15e1077ca723c6966b

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