Re: [whatwg/dom] Define a 'CancellationController' and 'CancellationSignal' interface. (#434)

I thought about the "cancelation steps" bits this morning, and it's not clear to me that they make sense if we want the signal to be observable by multiple things at once. That is, we would either need the "list of cancellation steps" that @domenic mentioned earlier, or we need to expose an event that the consumer-side spec would listen for. Aesthetically, I prefer the latter, though I realize that it's not really a concept that exists at the moment.

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