Re: [whatwg/dom] Define a "has listeners for" algorithm on EventTarget (#660)

It should be fine. I don't know the event dispatching process too well, but could it be possible that when "firing an event at the `Window` object with *legacy target override flag* set", event listeners registered on another object were also invoked? I'm guessing no, but it happened to be true then merely checking if the `Window` object has an `unload` event listener wouldn't been enough… (`body.onload` doesn't count, as the event _listener_ is registered on `Window` still.)

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