This adds a test for additional OPTIONS request generated by CORS XHRs showing up among network resources (it works now, but we have a bug report, so I thought having a test might be useful): http://crbug.com/71361
Created attachment 80774 [details] patch
Created attachment 80906 [details] patch to land - added tests for denied requests (both with and without prelfight checking)
Manually committed r77379: http://trac.webkit.org/changeset/77379