sandbox_bpf: rework how unsafe traps are compiled/verified

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 236c126df8dba0bf3b8a8a81d1a4c9991c6f176b..71dd2c708d1732685176c89cc2bc0c76ee807f6b 100644
--- a/sandbox/linux/seccomp-bpf/trap.h
+++ b/sandbox/linux/seccomp-bpf/trap.h
@@ -64,10 +64,6 @@ class SANDBOX_EXPORT Trap {
   // Returns "true", if unsafe traps were turned on.
   static bool EnableUnsafeTrapsInSigSysHandler();
 
-  // Returns true if a safe trap handler is associated with a
-  // particular trap ID.
-  static bool IsSafeTrapId(uint16_t id);
-
  private:
   struct TrapKey {
     TrapKey() : fnc(NULL), aux(NULL), safe(false) {}