Update from https://crrev.com/305340

sandbox/linux/seccomp-bpf-helpers/baseline_policy.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/baseline_policy.h"
 
 #include <errno.h>
 #include <sys/mman.h>
 #include <sys/socket.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
 #include <unistd.h>
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl.h"
 #include "sandbox/linux/seccomp-bpf-helpers/sigsys_handlers.h"
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_parameters_restrictions.h"
 #include "sandbox/linux/seccomp-bpf-helpers/syscall_sets.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/services/linux_syscalls.h"
+#include "sandbox/linux/services/syscall_wrappers.h"
 
 // Changing this implementation will have an effect on *all* policies.
 // Currently this means: Renderer/Worker, GPU, Flash and NaCl.
 
 using sandbox::bpf_dsl::Allow;
 using sandbox::bpf_dsl::Arg;
 using sandbox::bpf_dsl::Error;
 using sandbox::bpf_dsl::If;
 using sandbox::bpf_dsl::ResultExpr;
 
@@ skipping 198 matching lines @@
   return CrashSIGSYS();
 }
 
 }  // namespace.
 
 // Unfortunately C++03 doesn't allow delegated constructors.
 // Call other constructor when C++11 lands.
 BaselinePolicy::BaselinePolicy() : BaselinePolicy(EPERM) {}
 
 BaselinePolicy::BaselinePolicy(int fs_denied_errno)
-    : fs_denied_errno_(fs_denied_errno), policy_pid_(syscall(__NR_getpid)) {}
+    : fs_denied_errno_(fs_denied_errno), policy_pid_(sys_getpid()) {
+}
 
 BaselinePolicy::~BaselinePolicy() {
   // Make sure that this policy is created, used and destroyed by a single
   // process.
-  DCHECK_EQ(syscall(__NR_getpid), policy_pid_);
+  DCHECK_EQ(sys_getpid(), policy_pid_);
 }
 
 ResultExpr BaselinePolicy::EvaluateSyscall(int sysno) const {
   // Sanity check that we're only called with valid syscall numbers.
   DCHECK(SandboxBPF::IsValidSyscallNumber(sysno));
   // Make sure that this policy is used in the creating process.
   if (1 == sysno) {
-    DCHECK_EQ(syscall(__NR_getpid), policy_pid_);
+    DCHECK_EQ(sys_getpid(), policy_pid_);
   }
   return EvaluateSyscallImpl(fs_denied_errno_, policy_pid_, sysno);
 }
 
 ResultExpr BaselinePolicy::InvalidSyscall() const {
   return CrashSIGSYS();
 }
 
 }  // namespace sandbox.