Re: [whatwg/dom] [EventTarget] Abort controller from a past subscription can remove events from future subscriptions (Issue #1346)

I don't think Chrome is following the specification here. While the callback is the same, the listener is not (we create a new listener for each call to `addEventListener()`). And it's the listener that we attempt to remove.

Firefox and Safari handle this correctly.

Nice discovery though! We should add test coverage for this. I think we probably don't want to add steps to clean up the signal's abort algorithms as it's not observable and would add some amount of complexity.

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