[whatwg/dom] Following an abort signal (#569)

This PR makes it easier for one abort signal to follow another. This should avoid gotcha cases like https://github.com/whatwg/fetch/issues/668.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/569

-- Commit Summary --

  * Promise reference fix
  * Adding algorithm to allow one signal to follow another.

-- File Changes --

    M dom.bs (20)

-- Patch Links --

https://github.com/whatwg/dom/pull/569.patch
https://github.com/whatwg/dom/pull/569.diff

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