properly addes a default onFailure method to all Requests

fixes Bug 733639 - Unable to add Vold Utils and Menuitems libraries into an addon.

media/base/js/flightdeck/request.js

@@ -3,19 +3,22 @@
 var Request = require('shipyard/http/Request'),
     Cookie = require('shipyard/utils/Cookie'),
     log = require('shipyard/utils/log'),
-    dom = require('shipyard/dom'),
-
-    fd = dom.window.get('fd');
+    dom = require('shipyard/dom');
+
+function fd() {
+    return dom.window.get('fd');
+}
 
 Request.prototype.options.headers['X-CSRFToken'] = Cookie.read('csrftoken');
 
-Request.prototype.options.onFailure = function(text) {
+var oldInit = Request.prototype.initialize;
+var defaultFailure = function(text) {
     if (this.status !== 0 && text) {
         var response;
         try {
             response = JSON.parse(text);
         } catch (notJSON) {
-            log.warn('Response error is not valid JSON', text);
+            log.warn('Response error is not valid JSON');
             if (text.indexOf('<html') !== -1) {
                 // We somehow got a full HTML page. Bad!
                 log.error('Response is an HTML page!');
@@ -26,6 +29,16 @@ Request.prototype.options.onFailure = function(text) {
             }
         }
 
-        fd.error.alert(this.xhr.statusText, response);
+        fd().error.alert(this.xhr.statusText, response);
     }
 };
+
+Request.implement('initialize', function FD_Request(options) {
+    if (!options) {
+        options = {};
+    }
+    if (!options.onFailure) {
+        options.onFailure = defaultFailure;
+    }
+    oldInit.call(this, options);
+});