Re: [webcomponents] Define the behavior of '::slotted' (the former name is '::content'). (#331)

I recently did a search through the [Basic Web Components](https://github.com/basic-web-components/basic-web-components) project looking for where we currently use ::content. We concur with Polymer: the only cases where we currently use ::content are trying to style the direct children of an insertion point.

Regarding the name of this selector, it seems that the term "slotted" here is being used as a synonym for "assigned". For consistency with the use of "assigned" in the spec, and with existing API members such as getAssignedNodes(), perhaps this selector could be called ::assigned. That would reduce the number of terms and concepts a developer needs to learn here.

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