[whatwg/dom] Abort controller (#437)

Branched from https://github.com/whatwg/dom/pull/434
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/437

-- Commit Summary --

  * Define a 'PromiseController' and 'PromiseSignal' interface.
  * fixup 'abort steps'
  * fixup AbortError and whitespace.
  * fixup abort steps before event.
  * fixup rename to 'CancellationController'. Initial feedback.
  * fixup matching DOM's strange spelling of 'cancelled'
  * fixup SameObject
  * fixup ordered set of callbacks.
  * fixup disambiguate canceled flag.
  * fixup 'CancelationError' is now a 'DOMException'.
  * “cancel” to “abort”

-- File Changes --

    M dom.bs (144)

-- Patch Links --

https://github.com/whatwg/dom/pull/437.patch
https://github.com/whatwg/dom/pull/437.diff

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