We are relying in the XBL binding for the shadow host, we need to check
explicitly.
Also, we were checking in_shadow_tree, which is really broad. Just
is_html_slot_element should do, since the rest of the nodes should have only
light tree children.
Bug: 1425759
Reviewed-by: xidorn
MozReview-Commit-ID: KAFRVxaLsK
Browsing context names
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Dont make a network request when the media attribute of a link element is modified
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Add an IndexableText structure for text queries.
Instead of linear search for a node this now uses a HashMap.
Remove the now irrelevant fields from TextDisplayItem.
