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

@rniwa, I acknowledged that it can change for every node `n` in the event path `p`, or at least every other `n` if `ShadowRoot` is included on the path like it currently is in Blink. But that `event.path` can change at specific points during dispatch is not the same thing as it changing for every access, and `event.path===event.path` could still be made to hold true if we wanted. If `FrozenArray<T>` currently doesn't allow for this then that's a hassle, but not insurmountable.

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