Update from https://crrev.com/305340

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>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 #include "build/build_config.h"
+#include "sandbox/linux/services/syscall_wrappers.h"
 #include "sandbox/linux/services/thread_helpers.h"
 
 namespace sandbox {
 
 namespace {
 
 const char kSynchronisationChar[] = "D";
 
 void WaitForever() {
   while(true) {
@@ skipping 75 matching lines @@
 
   CHECK_EQ(c, kSynchronisationChar[0]);
   return true;
 }
 
 // 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.
-  int pid = syscall(__NR_getpid);
+  pid_t pid = sys_getpid();
   return pid == process_id_;
 }
 
 }  // namespace sandbox