Re: [whatwg/dom] Support `AbortSignal`s in `addEventListener`s options to unsubscribe from events? (#911)

I merged the implementation into chromium.
To try it out, install [chrome canary](https://www.google.com/chrome/canary/) and enable the "Experimental Web Platform Features" flag here: chrome://flags/#enable-experimental-web-platform-features

It isn't actually in canary yet at the time of writing this comment, but it should be in the next day or two. If you want to check, see if [this page](https://storage.googleapis.com/chromium-find-releases-static/f0b.html#f0bbc3f3ab2bf91bea606fbc5fda751f5e60a0d3) has a release version, and if it does, see if the your version in canary in chrome://version is newer than or equal to the version on that webpage.

I filed a tag review here to get feedback for the feature: https://github.com/w3ctag/design-reviews/issues/569

> I've started working on WPTs here: web-platform-tests/wpt#26472 I haven't run them or tested them fully yet but feel free to use the cases.

Thanks! I didn't catch this and I also added a WPT, but the more test coverage the better! I trust you much more than myself to capture all the use cases. If there are any edge cases you have in mind or possible differences between implementations, please test them.

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