Large IWYU cleanup for seccomp-bpf

sandbox/linux/seccomp-bpf/die.cc

Index: sandbox/linux/seccomp-bpf/die.cc
diff --git a/sandbox/linux/seccomp-bpf/die.cc b/sandbox/linux/seccomp-bpf/die.cc
index e5bc7c93847a7e5fec48d53804bddcdb0d8678d9..777c9d1139298f46d78bb1ef0a97667b48414015 100644
--- a/sandbox/linux/seccomp-bpf/die.cc
+++ b/sandbox/linux/seccomp-bpf/die.cc
@@ -2,16 +2,19 @@
 // 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/die.h"
+
 #include <errno.h>
-#include <linux/unistd.h>
+#include <signal.h>
 #include <stdio.h>
 #include <sys/prctl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
 
 #include <string>
 
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
-#include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/seccomp-bpf/syscall.h"
 
 namespace sandbox {