[whatwg/dom] Remove compound microtasks (#741)

Complements https://github.com/whatwg/html/pull/4437.

Also clarify which agent the mutation observer microtask queued member is obtained from.

Fixes #734.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/741

-- Commit Summary --

  * Remove compound microtasks

-- File Changes --

    M dom.bs (25)

-- Patch Links --

https://github.com/whatwg/dom/pull/741.patch
https://github.com/whatwg/dom/pull/741.diff

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