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Instead of trying to match the actual attribute rules, lets just look at the HashSet of attribute names. This is faster, though possibly less optimal if you use compound rules like .foo[attr]. That's rare though, and removing this extra RuleSet will allow simplifying SelectorChecker since hasAnyMatchingRules required a special mode where it tried to match selectors but ignored if the scope could really match. This paves the way to moving the RuleFeatureSet to be per-TreeScope instead of per-Document. I also made the API of classNamesAffectedByRules match the newly added attributesAffectedByRules to make SharedStyleFinder consistent. R=ojan@chromium.org Review URL: https://codereview.chromium.org/796583002