Re: [webcomponents] Composition Algorithm shouldn't unwrap slots (#308)

The [section 2.3](https://w3c.github.io/webcomponents/spec/shadow/#composed-trees) in the current shadow DOM says:

> In resolving CSS inheritance, an element must inherit from the parent node in the composed tree, if applicable.

I think this statement needs to be removed/revised since a slot element is the parent node of its assigned nodes in the composed tree.

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