Large IWYU cleanup for seccomp-bpf

sandbox/linux/seccomp-bpf/codegen_unittest.cc

Index: sandbox/linux/seccomp-bpf/codegen_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf/codegen_unittest.cc b/sandbox/linux/seccomp-bpf/codegen_unittest.cc
index 52fc24c692789ca43b46e1e71dd105842b845346..88f6130ae511f38c76f89b7531a4a075881b678c 100644
--- a/sandbox/linux/seccomp-bpf/codegen_unittest.cc
+++ b/sandbox/linux/seccomp-bpf/codegen_unittest.cc
@@ -2,13 +2,18 @@
 // 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/codegen.h"
+
 #include <errno.h>
+#include <linux/filter.h>
 
-#include <algorithm>
 #include <set>
+#include <string>
 #include <vector>
 
-#include "sandbox/linux/seccomp-bpf/codegen.h"
+#include "sandbox/linux/seccomp-bpf/basicblock.h"
+#include "sandbox/linux/seccomp-bpf/errorcode.h"
+#include "sandbox/linux/seccomp-bpf/instruction.h"
 #include "sandbox/linux/seccomp-bpf/sandbox_bpf.h"
 #include "sandbox/linux/tests/unit_tests.h"