Re: [w3c/webcomponents] Shadow DOM, <style>, and document.styleSheets (#56)

If `@import` doesn't work, it's probably more consistent to not load stylesheets at least inside a shadow tree.  On the other hand, we probably can't change the behavior of a browsering-context-less document.

That makes me think that the status quo of letting styles apply but failing to load `@import` might be the right behavior for a document without a browsing context as well as a shadow tree that is not connected to a document with a browsing context for consistency (since both `Document` and `ShadowRoot` has `styleSheets`, it's weird for them to behave differently).

That is, make `style` always work in a shadow tree but `@import` would work if and only if the style element is connected to a document with a browsing context.

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