I had to confess that I've spent a couple of hours on debugging due to this non-explicit constructor. RuleSet:::addRulesFromSheet is defined: RuleSet:addRulesFromSheet(StyleSheetContents*, const MediaQueryEvaluator&, StyleResolver* = 0, const ContainerNode* = 0) I wrongly called it with 'ruleSet.addRulesFromSheet(sheet, resolver)'. My bad. :(
Created attachment 184119 [details] Make it explicit
Created attachment 184120 [details] Fix a title.
Looks ok if all build-bots pass.
Comment on attachment 184120 [details] Fix a title. Clearing flags on attachment: 184120 Committed r140503: <http://trac.webkit.org/changeset/140503>
All reviewed patches have been landed. Closing bug.