Re: [whatwg/fetch] Aborting a fetch: The Next Generation (#447)

I'm not certain that `fetchEvent` should have the same kind of `observer` as an outgoing `fetch`, since, [as I noted earlier](https://github.com/whatwg/fetch/issues/447#issuecomment-270444061), those are fetches in *opposite directions*, privy to data of *opposite natures* (for a ServiceWorker, `uploadProgress` would represent data we're *getting*, but to a `fetch` caller, it represents data we're *sending*). Maybe two sibling classes that inherit from a common parent.

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