[whatwg/dom] Introduce "remove an event listener" primitive (#641)

This is needed for document.open(): https://github.com/whatwg/html/issues/2302.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/641

-- Commit Summary --

  * Introduce "remove an event listener" primitive

-- File Changes --

    M dom.bs (12)

-- Patch Links --

https://github.com/whatwg/dom/pull/641.patch
https://github.com/whatwg/dom/pull/641.diff

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