Update from https://crrev.com/305340

sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.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.
 
 // Note: any code in this file MUST be async-signal safe.
 
 #include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.h"
 
 #include <sys/syscall.h>
 #include <unistd.h>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 #include "build/build_config.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/seccomp-bpf/syscall.h"
 #include "sandbox/linux/services/linux_syscalls.h"
+#include "sandbox/linux/services/syscall_wrappers.h"
 
 #if defined(__mips__)
 // __NR_Linux, is defined in <asm/unistd.h>.
 #include <asm/unistd.h>
 #endif
 
 #define SECCOMP_MESSAGE_COMMON_CONTENT "seccomp-bpf failure"
 #define SECCOMP_MESSAGE_CLONE_CONTENT "clone() failure"
 #define SECCOMP_MESSAGE_PRCTL_CONTENT "prctl() failure"
 #define SECCOMP_MESSAGE_IOCTL_CONTENT "ioctl() failure"
@@ skipping 186 matching lines @@
   switch (args.nr) {
     case __NR_sched_getaffinity:
     case __NR_sched_getattr:
     case __NR_sched_getparam:
     case __NR_sched_getscheduler:
     case __NR_sched_rr_get_interval:
     case __NR_sched_setaffinity:
     case __NR_sched_setattr:
     case __NR_sched_setparam:
     case __NR_sched_setscheduler:
-      const pid_t tid = syscall(__NR_gettid);
+      const pid_t tid = sys_gettid();
       // The first argument is the pid.  If is our thread id, then replace it
       // with 0, which is equivalent and allowed by the policy.
       if (args.args[0] == static_cast<uint64_t>(tid)) {
         return Syscall::Call(args.nr,
                              0,
                              static_cast<intptr_t>(args.args[1]),
                              static_cast<intptr_t>(args.args[2]),
                              static_cast<intptr_t>(args.args[3]),
                              static_cast<intptr_t>(args.args[4]),
                              static_cast<intptr_t>(args.args[5]));
@@ skipping 54 matching lines @@
 
 const char* GetKillErrorMessageContentForTests() {
   return SECCOMP_MESSAGE_KILL_CONTENT;
 }
 
 const char* GetFutexErrorMessageContentForTests() {
   return SECCOMP_MESSAGE_FUTEX_CONTENT;
 }
 
 }  // namespace sandbox.