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

I'm not sure if option C would break the Web for Blink.  In theory, you should be able to add a sequence<Node> like object that can be called.  i.e. `event.path` would continue to behave like an array of Nodes and `event.path()` would be callable.

I'm gonna also add a new option:

**Option E)** Add Event.getPath() or Event.currentPath() as a method


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