remove_dead_workers

# File activesupport/lib/active_support/testing/parallelization/server.rb, line 54
        def remove_dead_workers(dead_pids)
          dead_pids.each do |dead_pid|
            worker_id = @worker_pids.key(dead_pid)
            if worker_id
              @active_workers.delete(worker_id)
              @worker_pids.delete(worker_id)
            end
          end
        end