Update from https://crrev.com/306655

sandbox/linux/services/syscall_wrappers.cc

Index: sandbox/linux/services/syscall_wrappers.cc
diff --git a/sandbox/linux/services/syscall_wrappers.cc b/sandbox/linux/services/syscall_wrappers.cc
index 3938694b720557b716110208a132532fec672acf..ede4964e94d7310500e9d360355c8059088c0433 100644
--- a/sandbox/linux/services/syscall_wrappers.cc
+++ b/sandbox/linux/services/syscall_wrappers.cc
@@ -56,4 +56,10 @@ void sys_exit_group(int status) {
   syscall(__NR_exit_group, status);
 }
 
+int sys_seccomp(unsigned int operation,
+                unsigned int flags,
+                const struct sock_fprog* args) {
+  return syscall(__NR_seccomp, operation, flags, args);
+}
+
 }  // namespace sandbox