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

chrome/test/data/extensions/api_test/context_menus/basics/test.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.
 
 var assertNoLastError = chrome.test.assertNoLastError;
 
 var tests = [
   function simple() {
     chrome.contextMenus.create({"title":"1"}, chrome.test.callbackPass());
   },
 
   function no_properties() {
     chrome.contextMenus.create({}, function(id) {
-      chrome.test.assertTrue(chrome.extension.lastError != null);
+      chrome.test.assertTrue(chrome.runtime.lastError != null);
       chrome.test.succeed();
     });
   },
 
   function remove() {
     var id;
     id = chrome.contextMenus.create({"title":"1"}, function() {
       assertNoLastError();
       chrome.contextMenus.remove(id, chrome.test.callbackPass());
     });
@@ skipping 52 matching lines @@
 }
 
 for (var i in types) {
   tests.push(makeCreateTest(types[i]));
 }
 for (var i in contexts) {
   tests.push(makeCreateTest("normal", [ contexts[i] ]));
 }
 
 chrome.test.runTests(tests);