[heycam/webidl] Should "perform some steps once a promise is settled" use %PromiseProto_then%? (#583)

https://heycam.github.io/webidl/#dfn-perform-steps-once-promise-is-settled

The current spec has

> 1. Let *then* be ? GetMethod(*promise*, "then").

which seems to imply that weird things may happen if you mess with a promise object or the prototype. That seems non-obvious and not particularly useful.

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https://github.com/heycam/webidl/issues/583