Removed unused field
Removed unused field

ndykman/CodeContracts,Microsoft/CodeContracts,Microsoft/CodeContracts,hubuk/CodeContracts,Microsoft/CodeContracts,huoxudong125/CodeContracts,huoxudong125/CodeContracts,Microsoft/CodeContracts,Microsoft/CodeContracts,ndykman/CodeContracts,ndykman/CodeContracts,hubuk/CodeContracts,hubuk/CodeContracts,ndykman/CodeContracts,huoxudong125/CodeContracts,Microsoft/CodeContracts,ndykman/CodeContracts,huoxudong125/CodeContracts,ndykman/CodeContracts,hubuk/CodeContracts,hubuk/CodeContracts,huoxudong125/CodeContracts,Microsoft/CodeContracts,huoxudong125/CodeContracts,huoxudong125/CodeContracts,hubuk/CodeContracts,ndykman/CodeContracts,hubuk/CodeContracts