Ryan VanderMeulen
44371c5262
Adds a smoke test for mozIPersonalDictionary's add/check/remove roundtrip, which previously had no automated coverage despite being a long-standing user-facing feature. The test asserts that a freshly-added word is accepted and that removal restores the rejected state. Ride-along with the Hunspell 1.7.3 update; the gap was noticed while auditing the spellchecker test surface during that work. Chrome script errors are surfaced as test failures rather than hangs. Differential Revision: https://phabricator.services.mozilla.com/D298929