Re: [whatwg/dom] Enable an event listener to be invoked just once (#207)

This makes sense to me.  I don't know if people would choose to use this (with feature detection / polyfill for the next several years) over just writing the remove code themselves.  But it seems like a nice easy little feature to have - even just planning for the far future when developers can depend on it being there.

@dtapuska / @tkent-google, what do you think?  Pretty trivial to add, right?

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