Fix unexpected error message when quickly select different wallpapers

chrome/browser/resources/chromeos/wallpaper_manager/js/util.js

Index: chrome/browser/resources/chromeos/wallpaper_manager/js/util.js
diff --git a/chrome/browser/resources/chromeos/wallpaper_manager/js/util.js b/chrome/browser/resources/chromeos/wallpaper_manager/js/util.js
index bd63042c0d691dd03192d53d6998ba785264b643..a43e79e9a95372c74b748b7e1e2e7c03e1180f58 100644
--- a/chrome/browser/resources/chromeos/wallpaper_manager/js/util.js
+++ b/chrome/browser/resources/chromeos/wallpaper_manager/js/util.js
@@ -61,6 +61,11 @@ WallpaperUtil.fetchURL = function(url, type, onSuccess, onFailure, opt_xhr) {
     xhr.addEventListener('loadend', function(e) {
       if (this.status == 200) {
         onSuccess(this);
+      } else if (this.status == 0) {

[flackr, 2013/09/06 15:44:00]

A status of 0 can also result from a network error it seems:
http://www.w3.org/TR/XMLHttpRequest/#the-status-attribute

I agree if the request is aborted that we shouldn't trigger an error because it
was an intentional cancellation but we should be careful not to silently fail in
other cases.

+        // The status attribute may return 0 if this request is aborted when
+        // readystate is UNSENT or OPENED. No error message should show. See
+        // http://crbug.com/242581.
+        return;
       } else {
         onFailure();
       }