Elliott Sprehn 04288dc280 Simplify tree scope tracking in StyleEngine.
ShadowRoot should deal with adding and removing itself from the active
scope list. HTMLStyleElement should just add/remove itself directy from
the StyleSheetCollection on the scope its entering or leaving in
insertedInto/removedFrom.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/844133002
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