Re: [whatwg/dom] cancelBubble legacy property (#211)

I opened 10 of them "at random" and took a quick look. Mostly it's used as a fallback when `stopPropagation` doesn't exist, but those cases wouldn't show up in use counter data.

In https://maps.googleapis.com/maps/api/js and http://w.sharethis.com/share5x/js/stcommon.2b05accc08f1ee42fe1983647ab923ea.js and multiple other scripts it's used together with `stopPropagation` which would show up in use counters but removing it probably wouldn't be observable.

In http://www.speedup.ir/angular/app/scripts/vendor/jquery.nicescroll.js there are many uses, most similar to the above but one that's gated on `document.fireEvent`:
```JavaScript
      else if (document.fireEvent) {
        this.notifyScrollEvent = function(el) {
          var e = document.createEventObject();
          el.fireEvent("onscroll");
          e.cancelBubble = true; 
        };
      }
```
As long as Edge has removed `document.fireEvent`, that should be dead code everywhere.

In http://kolelnasmag.com/wp-content/themes/Fikra%20Mag3/js/uisearch.js there's an `addEventListener` polyfill which should also be dead code now.

In https://static.xx.fbcdn.net/rsrc.php/v2iaFb4/yH/l/en_US/0bcWBIJHikk.js @domenic makes an appearance :)
```JavaScript
/**
 * @generated SignedSource<<4c94898b765e9ddb7bac02513e528723>>
 *
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 * !! This file is a check-in of a static_upstream project!      !!
 * !!                                                            !!
 * !! You should not modify this file directly. Instead:         !!
 * !! 1) Use `fjs use-upstream` to temporarily replace this with !!
 * !!    the latest version from upstream.                       !!
 * !! 2) Make your changes, test them, etc.                      !!
 * !! 3) Use `fjs push-upstream` to copy your changes back to    !!
 * !!    static_upstream.                                        !!
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 *
 * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic
 * Denicola
```

Anyway, in that file there's a bit of code that I saw in a few places, seems like this is the unminified code:
https://github.com/davidxi/js-code-study/blob/9b990abbf038e0195567b30c8da216498c23691b/src/Event.js

It looks like this isn't actually an `Event` but a custom `EventObject` so it shouldn't be a problem.

That was a very quick check, but I didn't see anyone setting `cancelBubble` to false and it seems plausible that mapping `cancelBubble=true` to `stopPropagation()` is web compatible, at least worth investigating.

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