• Update WebIDL.py to 4166cae81546 

    https://hg.mozilla.org/integration/autoland/rev/4166cae81546f54accae807413f806d20bf30920

Pulls in changes from https://bugzilla.mozilla.org/show_bug.cgi?id=1359269
    @Manishearth
    Manishearth committed Mar 4, 2019
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