 bogusURLStyle)
            {
                async_test(function(test)
                {
                    var mediaSource = new MediaSource();
                    var bogusURL = URL.createObjectURL(mediaSource);

                    if (bogusURLStyle == "corrupted") {
                        var goodURL = bogusURL;
                        test.add_cleanup(function() { URL.revokeObjectURL(goodURL); });
                        bogusURL += "0";
                    } else if (bogusURLStyle == "revoked") {
 