Use DISPATCH_DATA_DESTRUCTOR_DEFAULT for NSMutableData
Use DISPATCH_DATA_DESTRUCTOR_DEFAULT for NSMutableData

Summary: This will prevent any conditions that could result in the underlying mutation of the buffer and moves the lifecycle of the underlying buffer into the dispatch_data and away from the `-[NSData dealloc]`

Reviewed By: zeyadsalloum

Differential Revision: D13621261

fbshipit-source-id: 03509d5861ded3e9405153a244d363d807aac848

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