Update from https://crrev.com/316786

sandbox/linux/services/scoped_process.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/services/scoped_process.h"
 
 #include <fcntl.h>
 #include <signal.h>
 #include <sys/stat.h>
 #include <sys/syscall.h>
@@ skipping 21 matching lines @@
   }
 }
 
 }  // namespace
 
 ScopedProcess::ScopedProcess(const base::Closure& child_callback)
     : child_process_id_(-1), process_id_(getpid()) {
   PCHECK(0 == pipe(pipe_fds_));
 #if !defined(THREAD_SANITIZER)
   // Make sure that we can safely fork().
-  CHECK(ThreadHelpers::IsSingleThreaded(-1));
+  CHECK(ThreadHelpers::IsSingleThreaded());
 #endif
   child_process_id_ = fork();
   PCHECK(0 <= child_process_id_);
 
   if (0 == child_process_id_) {
     PCHECK(0 == IGNORE_EINTR(close(pipe_fds_[0])));
     pipe_fds_[0] = -1;
     child_callback.Run();
     // Notify the parent that the closure has run.
     CHECK_EQ(1, HANDLE_EINTR(write(pipe_fds_[1], kSynchronisationChar, 1)));
@@ skipping 58 matching lines @@
 // It would be problematic if after a fork(), another process would start using
 // this object.
 // This method allows to assert it is not happening.
 bool ScopedProcess::IsOriginalProcess() {
   // Make a direct syscall to bypass glibc caching of PIDs.
   pid_t pid = sys_getpid();
   return pid == process_id_;
 }
 
 }  // namespace sandbox