sandbox_bpf: rework how unsafe traps are compiled/verified

sandbox/linux/seccomp-bpf/trap.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // 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/trap.h"
 
 #include <errno.h>
 #include <signal.h>
 #include <string.h>
 #include <sys/syscall.h>
@@ skipping 362 matching lines @@
     } else {
       SANDBOX_INFO(
           "Cannot disable sandbox and use unsafe traps unless "
           "CHROME_SANDBOX_DEBUGGING is turned on first");
     }
   }
   // Returns the, possibly updated, value of has_unsafe_traps_.
   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