Re: [webcomponents] Change deepPath() back to path (a FrozenArray<EventTarget> attribute) (#428)

Yes, a method would have been better, and I understand that nobody objected when this change was made. But the situation we find ourselves in is that nobody can say if or when `Event.path` can be deprecated and removed from Blink. Lacking some way of estimating the compat risk of such a change, there's just no way to proceed.

I think the options are:
 1. A certainty of getting only a less-than-ideal API, the `event.path` attribute.
 2. An x% chance of getting only the nicer API, `event.deepPath()` and a (100-x)% chance of getting both `event.path` and `event.deepPath()`.

Because I think *x* is a relatively small number, option 2 looks risky to me.

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