[Webkit-unassigned] [Bug 76760] New: Chrome 18 fails html5test.com XHR Blob response test

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=76760

           Summary: Chrome 18 fails html5test.com XHR Blob response test
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: eric at webkit.org
                CC: abarth at webkit.org, michaeln at google.com,
                    ericu at chromium.org
            Blocks: 40829


Chrome 18 fails html5test.com XHR Blob response test

This is the test:

testResponseTypeBlob: function(item) {
                    if (!window.XMLHttpRequest || !window.Blob) return;

                    var xhr = new window.XMLHttpRequest();

                    if (typeof xhr.responseType == 'undefined') return;

                    var done = false;

                    xhr.onreadystatechange = function() {
                        if (this.readyState == 4 && !done) {
                            done = true;
                            passed = false;

                            try {
                                passed = !!(this.response && this.response instanceof Blob);
                            } catch(e) {
                            }                            

                            item.stopBackground();
                            item.update({
                                'passed': passed
                            });
                        }
                    }

                    try {
                        item.startBackground();
                        xhr.open("GET", "detect.html");
                        xhr.responseType = "blob";
                        xhr.send();
                    } catch (e) {
                        item.stopBackground();
                    }
                },

i've run the test manually in the inspector (while inspecting the main page on html5test.com)

And found that we get xhr.response == null when fetching detect.html.

Unclear why.  It's also possible the test is wrong.

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