Two return parameters are expected instead of the actual one (WebInspector.CSSStyleModel.setRuleSelector()) due to the latest protocol method changes.
Created attachment 85313 [details] [PATCH] Suggested fix
Committing to http://svn.webkit.org/repository/webkit/trunk ... M Source/WebCore/ChangeLog M Source/WebCore/inspector/front-end/CSSStyleModel.js Committed r80719