Update references to the extension messaging APIs to point to the "runtime"

chrome/test/data/extensions/api_test/permissions/optional_deny/background.js

 // Copyright (c) 2012 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.
 
 var assertFalse = chrome.test.assertFalse;
 var assertTrue = chrome.test.assertTrue;
 var pass = chrome.test.callbackPass;
 
 var NO_BOOKMARKS_PERMISSION =
     "You do not have permission to use 'bookmarks.getTree'.";
@@ skipping 23 matching lines @@
     req.send(null);
   }
 
   chrome.test.runTests([
     function denyRequest() {
       chrome.permissions.request(
           {permissions: ['bookmarks'], origins: ['http://*.c.com/*']},
           pass(function(granted) {
             // They were not granted, and there should be no error.
             assertFalse(granted);
-            assertTrue(chrome.extension.lastError === undefined);
+            assertTrue(chrome.runtime.lastError === undefined);
 
             // Make sure they weren't granted...
             chrome.permissions.contains(
                 {permissions: ['bookmarks'], origins:['http://*.c.com/*']},
                 pass(function(result) { assertFalse(result); }));
 
             try {
               chrome.bookmarks.getTree(function() {
                 chrome.test.fail("Should not have bookmarks API permission.");
               });
@@ skipping 10 matching lines @@
     function noPromptForActivePermissions() {
       // We shouldn't prompt if the extension already has the permissions.
       chrome.permissions.request(
           {permissions: ["management"]},
           pass(function(granted) {
         assertTrue(granted);
       }));
     }
   ]);
 });