[whatwg/dom] Make removeEventListener() return a useful value (#471)

Forked from #208:

> It would be nice if we could make removeEventListener() return a value indicating if anything was removed. A Boolean or integer count, for example.
> 
> Maybe this is orthogonal, but it could help developers figure out if they are matching listeners like they intended.
> 
> I guess returning undefined could be some compat requirement, though.

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