SECCOMP-BPF: Refactor the BPF sandbox API to use fewer "static" fields and methods.

sandbox/linux/seccomp-bpf/trap.h

Index: sandbox/linux/seccomp-bpf/trap.h
diff --git a/sandbox/linux/seccomp-bpf/trap.h b/sandbox/linux/seccomp-bpf/trap.h
index 40e7109d2fed69fb74f1996c7e67365dc296ecd7..db29757c0dbeb5c357006d1afdfd35a7e9ef8cad 100644
--- a/sandbox/linux/seccomp-bpf/trap.h
+++ b/sandbox/linux/seccomp-bpf/trap.h
@@ -5,9 +5,15 @@
 #ifndef SANDBOX_LINUX_SECCOMP_BPF_TRAP_H__
 #define SANDBOX_LINUX_SECCOMP_BPF_TRAP_H__
 
+#include <signal.h>
+#include <stdint.h>
+
 #include <map>
 #include <vector>
 
+#include "sandbox/linux/seccomp-bpf/port.h"
+
+
 namespace playground2 {
 
 class ErrorCode;