fix bookmarks API crash when handling invalid URL

chrome/renderer/resources/extension_apitest.js

 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // extension_apitest.js
 // mini-framework for ExtensionApiTest browser tests
 
 var chrome = chrome || {};
 (function() {
   chrome.test = chrome.test || {};
@@ skipping 155 matching lines @@
     if (func) {
       chrome.test.assertEq(typeof(func), 'function');
     }
     var callbackCompleted = chrome.test.callbackAdded();
 
     return function() {
       if (expectedError == null) {
         chrome.test.assertNoLastError();
       } else {
         chrome.test.assertEq(typeof(expectedError), 'string');
+        chrome.test.assertTrue(chrome.extension.lastError != undefined,
+            "No lastError, but expected " + expectedError);
         chrome.test.assertEq(expectedError, chrome.extension.lastError.message);
       }
 
       if (func) {
         safeFunctionApply(func, arguments);
       }
 
       callbackCompleted();
     };
   };
@@ skipping 21 matching lines @@
     };
 
     event.addListener(listener);
     return done;
   };
 
   chrome.test.callbackPass = function(func) {
     return chrome.test.callback(func);
   };
 
-  chrome.test.callbackFail = function(expectedError) {
-    return chrome.test.callback(null, expectedError);
+  chrome.test.callbackFail = function(expectedError, func) {
+    return chrome.test.callback(func, expectedError);
   };
 
   chrome.test.runTests = function(tests) {
     chrome.test.tests = tests;
     chrome.test.runNextTest();
   };
 })();