Re: [whatwg/dom] Allow postMessage-ing AbortSignal (#948)

That seems reasonable to me and is compatible with what we are planning to do for Fetch (see https://github.com/whatwg/fetch/pull/1343). (The current plan there is to serialize/deserialize abort reason and recreate the `AbortSignal` as we already have a channel with the service worker, but it's not distinguishable from the above I think.)

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