Stop exporting AbortSignal's signal abort #1194
Description
As identified in #1152 it would be good to no longer do this. https://dontcallmedom.github.io/webdex/s.html#signal%20abort%40%40AbortSignal%40dfn identifies specifications to update first.
Separately there's
(probably) Make sure algorithms are being removed when they will no longer have an effect, e.g. when the underlying operation is completed or failed.
which maybe requires its own issue. Not sure.
cc @shaseley