[whatwg/dom] No longer support ProgressEvent in createEvent() (#421)

Tests: https://github.com/w3c/web-platform-tests/pull/5158.

Fixes #289.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/421

-- Commit Summary --

  * No longer support ProgressEvent in createEvent()

-- File Changes --

    M dom.bs (1)

-- Patch Links --

https://github.com/whatwg/dom/pull/421.patch
https://github.com/whatwg/dom/pull/421.diff

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