Allow status = 0 when XHR is completed in Audit.loadFileFromUrl().

third_party/WebKit/LayoutTests/webaudio/resources/audit.js

Index: third_party/WebKit/LayoutTests/webaudio/resources/audit.js
diff --git a/third_party/WebKit/LayoutTests/webaudio/resources/audit.js b/third_party/WebKit/LayoutTests/webaudio/resources/audit.js
index bd3051a570d6abe54d71d85320f02c1ddd3a5e2b..ae615bdecdb482dc14f9198bd4010fe3a28753ac 100644
--- a/third_party/WebKit/LayoutTests/webaudio/resources/audit.js
+++ b/third_party/WebKit/LayoutTests/webaudio/resources/audit.js
@@ -1191,15 +1191,19 @@ window.Audit = (function () {
   function loadFileFromUrl (fileUrl) {
     return new Promise((resolve, reject) => {
       let xhr = new XMLHttpRequest();
-      xhr.open('GET', fileUrl);
+      xhr.open('GET', fileUrl, true);
       xhr.responseType = 'arraybuffer';
 
       xhr.onload = () => {
-        if (xhr.status === 200) {
+        // |status = 0| is a workaround for the run-webkit-test server. We are
+        // speculating the server quits the transaction prematurely without
+        // completing the request.
+        if (xhr.status === 200 || xhr.status === 0) {
           resolve(xhr.response);
         } else {
           let errorMessage = 'loadFile: Request failed when loading ' +
-              fileUrl + '. (' + xhr.statusText + ')';
+              fileUrl + '. ' + xhr.statusText + '. (status = ' +
+              xhr.status + ')';
           if (reject) {
             reject(errorMessage);
           } else {