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

chrome/test/data/extensions/api_test/messaging/connect_external/test.js

 // Copyright (c) 2011 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 testId = "bjafgdebaacbbbecmhlhpofkepfkgcpa";
 
 chrome.test.runTests([
   function connectExternal() {
-    var port = chrome.extension.connect(testId, {name: "extern"});
+    var port = chrome.runtime.connect(testId, {name: "extern"});
     port.postMessage({testConnectExternal: true});
     port.onMessage.addListener(chrome.test.callbackPass(function(msg) {
       chrome.test.assertTrue(msg.success, "Message failed.");
       chrome.test.assertEq(msg.senderId, location.host,
                            "Sender ID doesn't match.");
     }));
   }
 ]);