Failure in reading Blob URL should results in network error

chrome/test/data/extensions/api_test/mime_handler_view/index.js

Index: chrome/test/data/extensions/api_test/mime_handler_view/index.js
diff --git a/chrome/test/data/extensions/api_test/mime_handler_view/index.js b/chrome/test/data/extensions/api_test/mime_handler_view/index.js
index b3187d2aded3d5e4cc5f9386ad4cddfed43e3122..49f137efa5d5d92a80a87dcdc499600d6570bb14 100644
--- a/chrome/test/data/extensions/api_test/mime_handler_view/index.js
+++ b/chrome/test/data/extensions/api_test/mime_handler_view/index.js
@@ -20,7 +20,7 @@ var streamDetails;
 function fetchUrl(url) {
   return new Promise(function(resolve, reject) {
     var request = new XMLHttpRequest();
-    request.onreadystatechange = function() {
+    request.onload = function() {
       if (request.readyState == 4) {
         resolve({
           status: request.status,
@@ -28,6 +28,13 @@ function fetchUrl(url) {
         });
       }
     };
+    request.onerror = function(e) {
+      // Network error.
+      resolve({
+        status: request.status,
+        data: 'error',
+      });
+    }
     request.open('GET', streamDetails.streamUrl, true);
     request.send();
   });
@@ -88,8 +95,8 @@ var tests = [
     checkStreamDetails('testAbort.csv', false);
     chrome.mimeHandlerPrivate.abortStream(function() {
       fetchUrl(streamDetails.streamUrl).then(function(response) {
-        chrome.test.assertEq(404, response.status);
-        chrome.test.assertEq('', response.data);
+        chrome.test.assertEq(0, response.status);
+        chrome.test.assertEq('error', response.data);
         chrome.test.succeed();
       });
     });