Don't conform to the spec with isTrusted. The spec defines it as
`LegacyUnforgeable` but defining it in the constructor has a big
performance impact and the property doesn't seem to be useful outside of
browsers.
Refs: https://github.com/nodejs/performance/issues/32
PR-URL: https://github.com/nodejs/node/pull/46974
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: James M Snell <jasnell@gmail.com>