Re: [webcomponents] [Shadow] Focus on shadow host should slide to its inner focusable node (delegatesFocus) (#105)

Moving the focus automatically to an inner-focusable element makes sense to me.

Now, once we made the focus to be automatically delegated as proposed on this issue, I can't think of a good reason to keep `delegatesFocus` flag.  It appears to me that, the only useful flag value is `false` to turn off the delegation in that world but we could simply not delegating the focus when the shadow DOM only contains elements without `tabindex` or a negative `tabindex` to address the same use case.

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