Re: [fetch] Aborting a fetch (#27)

@martinthomson `doSomethingInnocuous()` already has a bug if `innocuousActivity()` ever rejects. I (believe I) differ from @jakearchibald in thinking that cancellation should always result in either a resolved or rejected `CancellablePromise`, rather than adding a third state, and if cancellation results in a rejection, then `doSomethingInnocuous()`'s rejection handler will get to do whatever it did in a pre-cancellation world.

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