minijail: remove minijail_run_pid_pipe()

Since all calls of minijail_run_pid_pipe() have been replaced
by calls to minijail_run_pid_pipes(), remove the former
function as it is unused.

BUG: 24577038
Change-Id: I561fe4ab3ad7a78b05c67b1e1b56e761320603a2
3 files changed