Remove redundant process setup
Remove redundant process setup

PR_SET_PDEATHSIG is already issued for init process in SanitizeCurrentProcess
Same for setsid

PiperOrigin-RevId: 258142844
Change-Id: Iad9e94bd402d576c1b24caab0b03efc50e2df07e

google/sandboxed-api,google/sandboxed-api,google/sandboxed-api,google/sandboxed-api