sandbox: Convert remaining legacy tests to use policy classes

sandbox/linux/seccomp-bpf-helpers/baseline_policy_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sandbox/linux/seccomp-bpf-helpers/baseline_policy.h"
 
 #include <errno.h>
+#include <fcntl.h>
 #include <linux/futex.h>
 #include <sched.h>
 #include <signal.h>
 #include <string.h>
 #include <sys/prctl.h>
 #include <sys/resource.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
 #include <sys/time.h>
@@ skipping 323 matching lines @@
                  ClockGettimeWithDisallowedClockCrashes,
                  DEATH_SEGV_MESSAGE(sandbox::GetErrorMessageContentForTests()),
                  BaselinePolicy) {
   struct timespec ts;
   clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
 }
 
 }  // namespace
 
 }  // namespace sandbox