Re: [webcomponents] scoped and relatedTargetScoped attributes are useless in Event, so remove then from Event interface (#442)

What is the use case for the flags? I mean real world use case. 
In XBL world we haven't had anything like them and no one has ever asked such to be added.
In Gecko we have similar-ish flags in C++, but those haven't ever been exposed to JS.
(and in fact in Gecko the flags are more about content<->chrome and preventing content to see some events, yet let chrome to see them, not about scoping events withing content.)

I'm not strongly against them, mostly just wondering whether we're adding something no one will ever use.

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