Removes support for using the system clock on ChromeOS

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

 // Copyright (c) 2013 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/syscall_parameters_restrictions.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <fcntl.h>
 #include <linux/net.h>
 #include <sched.h>
 #include <signal.h>
 #include <stdint.h>
 #include <sys/mman.h>
 #include <sys/prctl.h>
 #include <sys/resource.h>
 #include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <time.h>
 #include <unistd.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/time/time.h"

[rickyz (no longer on Chrome), 2015/10/29 21:05:02]

Can this include be removed as well?

[charliea (OOO until 10-5), 2015/10/29 21:16:37]

Thanks for catching that! I was thinking that it couldn't because we were still
using the CLOCK_FOO constants, but those were actually coming from <time.h>

 #include "build/build_config.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
 #include "sandbox/linux/bpf_dsl/seccomp_macros.h"
 #include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/system_headers/linux_futex.h"
 #include "sandbox/linux/system_headers/linux_syscalls.h"
 #include "sandbox/linux/system_headers/linux_time.h"
 
 // PNaCl toolchain does not provide sys/ioctl.h header.
@@ skipping 260 matching lines @@
 ResultExpr RestrictGetrusage() {
   const Arg<int> who(0);
   return If(who == RUSAGE_SELF, Allow()).Else(CrashSIGSYS());
 }
 #endif  // !defined(OS_NACL_NONSFI)
 
 ResultExpr RestrictClockID() {
   static_assert(4 == sizeof(clockid_t), "clockid_t is not 32bit");
   const Arg<clockid_t> clockid(0);
   return If(
-#if defined(OS_CHROMEOS)
-             // Allow the special clock for Chrome OS used by Chrome tracing.
-             clockid == base::TraceTicks::kClockSystemTrace ||
-#endif
                  clockid == CLOCK_MONOTONIC ||
                  clockid == CLOCK_MONOTONIC_COARSE ||
                  clockid == CLOCK_PROCESS_CPUTIME_ID ||
                  clockid == CLOCK_REALTIME ||
                  clockid == CLOCK_REALTIME_COARSE ||
                  clockid == CLOCK_THREAD_CPUTIME_ID,
              Allow()).Else(CrashSIGSYS());
 }
 
 }  // namespace sandbox.