Masayuki Nakano 3169bc5de5 Bug 1720252 - Get rid of "dom.input_events.beforeinput.enabled" from tests r=smaug
`beforeinput` event was shipped and it won't be disabled for avoiding confusion
of web developers. So, we can drop the pref setting of
"dom.input_events.beforeinput.enabled" in our tests.

Depends on D119716

Differential Revision: https://phabricator.services.mozilla.com/D119729
2021-07-13 10:02:12 +00:00
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