Re: [ServiceWorker] Returning a FetchPromise from fetch() (#625)

I'm imagining that the resolving behavior for `FetchPromise` creates a no-op cancel when the argument is not a `FetchPromise`, but when it is, it properly sets up a chaining cancel.  So the `FetchPromise` created by `.then()` resolves with the result of fetch, and chains its cancel from it.  As long as nothing else chains off of the `fetch()` result, the ref-count will be 1, so when you call `p.cancel()` it'll chain up and cancel the `fetch()` result as well.

(Sorry, I thought this was obvious; otherwise chaining cancellable things doesn't work at all, in any circumstance.)

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