Re: [uievents] Specify MouseEvent.which (#35)

That sounds good. I added `which` to `KeyboardEvent` and `MouseEvent` in Blink only to be able to measure the remaining usage of `which` on `UIEvent`, but it sounds like simply leaving `which` on `UIEvent` will be safer. As soon as the spec says this, I'll remove it from `KeyboardEvent` and `MouseEvent` again.

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