[XMLHttpRequest] Stop throwing for network error in async mode

LayoutTests/fast/files/apply-blob-url-to-xhr.html

Index: LayoutTests/fast/files/apply-blob-url-to-xhr.html
diff --git a/LayoutTests/fast/files/apply-blob-url-to-xhr.html b/LayoutTests/fast/files/apply-blob-url-to-xhr.html
index 7b9eda17ce460d116dfac7af42a9a4b13bce571a..a00418f031c5dcd7e8ecc7863f1a934b5cf96d96 100644
--- a/LayoutTests/fast/files/apply-blob-url-to-xhr.html
+++ b/LayoutTests/fast/files/apply-blob-url-to-xhr.html
@@ -4,43 +4,13 @@
 <input type="file" name="file" id="file" onchange="onInputFileChange()">
 <pre id='console'></pre>
 
+<script src="resources/apply-blob-url-to-xhr.js"></script>
 <script>
-function log(message)
-{
-    document.getElementById('console').appendChild(document.createTextNode(message + "\n"));
-}
-
-function sendXMLHttpRequest(method, url)
-{
-    var xhr = new XMLHttpRequest();
-    xhr.open(method, url, false);
-    try {
-        xhr.send();
-        log("Status: " + xhr.status);
-        log("Response: " + xhr.responseText);
-    } catch (error) {
-        log("Received exception, code: " + error.code + ", name: " + error.name + ", message: " + error.message);
-    }
-}
-
 function onInputFileChange()
 {
     var file = document.getElementById("file").files[0];
-    var fileURL = window.URL.createObjectURL(file);
-
-    log("Test that XMLHttpRequest GET succeeds.");
-    sendXMLHttpRequest("GET", fileURL);
-
-    log("Test that XMLHttpRequest POST fails.");
-    sendXMLHttpRequest("POST", fileURL);
-
-    log("Test that XMLHttpRequest GET fails after the blob URL is revoked.");
-    window.URL.revokeObjectURL(fileURL);
-    sendXMLHttpRequest("GET", fileURL);
 
-    log("DONE");
-    if (testRunner.notifyDone)
-        testRunner.notifyDone();
+    runXHRs(file);
 }
 
 function runTests()