Re: [webcomponents] [shadow-dom] Fix #102, updating Element.createShadowRoot() so that it throws an exception. (9b65780)

Do you suggest that we shouldn't mention binding property in the spec?

My understanding is:
- I'll refer to binding property to enumerate the names, however, binding property is only used to create such a fixed list. createShadowRoot() shouldn't look at binding property at runtime.

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