Re: [whatwg/dom] Encourage use of AbortError for cancellation? (#927)

> Basically it's up to userland to create a `class AbortError extends Error { code = 'ABORT_ERR' }`.

This is different to browsers, `abortError.code` is just a number in `DOMException`. Currently I've been using `.name === "AbortError"`, however this is somewhat fragile against userland classes as they might forget to add `name = "AbortError";` into the class.

This is one reason I think it'd strongly be best if there was a global exposed in both Node and Browsers that could construct a "blessed" `AbortError` so that people can reliably both construct them and check if a given error is an `AbortError` without relying on userland to correctly implement many copies of `AbortError`. (Or something like the alternative I described above where `abortController.abort()` constructs one).

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