sandbox_bpf: rework how unsafe traps are compiled/verified

sandbox/linux/seccomp-bpf/trap.cc

Index: sandbox/linux/seccomp-bpf/trap.cc
diff --git a/sandbox/linux/seccomp-bpf/trap.cc b/sandbox/linux/seccomp-bpf/trap.cc
index 8860ac12ea490d61897bb730a48181c76364ceb0..8fa31740855a4dd94586b7c96aa80a1da91db0f0 100644
--- a/sandbox/linux/seccomp-bpf/trap.cc
+++ b/sandbox/linux/seccomp-bpf/trap.cc
@@ -380,13 +380,6 @@ bool Trap::EnableUnsafeTrapsInSigSysHandler() {
   return trap->has_unsafe_traps_;
 }
 
-bool Trap::IsSafeTrapId(uint16_t id) {
-  if (global_trap_ && id > 0 && id <= global_trap_->trap_array_size_) {
-    return global_trap_->trap_array_[id - 1].safe;
-  }
-  return false;
-}
-
 Trap* Trap::global_trap_;
 
 }  // namespace sandbox