Re: [webcomponents] [Shadow]: Update constraints around stopping events (bugzilla: 20247) (#61)

What we need to do is identify which event dispatching code needs to set this flag. E.g. the code dispatching events for `<img>` will need to set this flag. But the code dispatching events for `XMLHttpRequest` does not. Both dispatch `error` events so that's why it's important to figure out the dispatch sources.

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