Update from https://crrev.com/306655

sandbox/linux/services/syscall_wrappers.h

Index: sandbox/linux/services/syscall_wrappers.h
diff --git a/sandbox/linux/services/syscall_wrappers.h b/sandbox/linux/services/syscall_wrappers.h
index 03d5cdf8891ab2697590d27fb97f09fb5a96e244..15ec81bf3e828ec03758ba4e4dd2056cb25424e8 100644
--- a/sandbox/linux/services/syscall_wrappers.h
+++ b/sandbox/linux/services/syscall_wrappers.h
@@ -9,6 +9,8 @@
 
 #include "sandbox/sandbox_export.h"
 
+struct sock_fprog;
+
 namespace sandbox {
 
 // Provide direct system call wrappers for a few common system calls.
@@ -30,6 +32,12 @@ SANDBOX_EXPORT long sys_clone(unsigned long flags,
 
 SANDBOX_EXPORT void sys_exit_group(int status);
 
+// The official system call takes |args| as void*  (in order to be extensible),
+// but add more typing for the cases that are currently used.
+SANDBOX_EXPORT int sys_seccomp(unsigned int operation,
+                               unsigned int flags,
+                               const struct sock_fprog* args);
+
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SERVICES_SYSCALL_WRAPPERS_H_