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

sandbox/linux/seccomp-bpf/syscall_unittest.cc

Index: sandbox/linux/seccomp-bpf/syscall_unittest.cc
diff --git a/sandbox/linux/seccomp-bpf/syscall_unittest.cc b/sandbox/linux/seccomp-bpf/syscall_unittest.cc
index 11fa315611293a58ec111f2122e68dd18f988923..136deb615cb514108d4e154f5e1c95cab5e7e0bd 100644
--- a/sandbox/linux/seccomp-bpf/syscall_unittest.cc
+++ b/sandbox/linux/seccomp-bpf/syscall_unittest.cc
@@ -78,12 +78,12 @@ intptr_t CopySyscallArgsToAux(const struct arch_seccomp_data& args, void *aux) {
   return -ENOMEM;
 }
 
-ErrorCode CopyAllArgsOnUnamePolicy(int sysno, void *aux) {
+ErrorCode CopyAllArgsOnUnamePolicy(Sandbox *sandbox, int sysno, void *aux) {
   if (!Sandbox::IsValidSyscallNumber(sysno)) {
     return ErrorCode(ENOSYS);
   }
   if (sysno == __NR_uname) {
-    return Sandbox::Trap(CopySyscallArgsToAux, aux);
+    return sandbox->Trap(CopySyscallArgsToAux, aux);
   } else {
     return ErrorCode(ErrorCode::ERR_ALLOWED);
   }