Use contiguous dispatch_data_t bridging to NSData
Use contiguous dispatch_data_t bridging to NSData

Summary: Partial redux of D13596759 to perform gradual changes to how data is handled

Reviewed By: zeyadsalloum

Differential Revision: D13609842

fbshipit-source-id: 9f1e6e336a81b2f2388ef31359f7fb261296653e

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