Re: [dom] Drop "keyevents" as an alias of "keyboardevent" for createEvent (#148)

Gecko used to have only keyevents, and keyboardevent was added in 
https://bugzilla.mozilla.org/show_bug.cgi?id=238773, so, long ago.
In mozilla-central there are several tests using "keyevents", so I guess would need to fix those and then add some telemetry and based on that say something here.

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