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

chrome/test/data/extensions/api_test/executescript/frame_after_load/test.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 baseUrl = 'http://a.com:PORT/files/extensions/api_test/executescript/' +
     'frame_after_load/';
 
 chrome.tabs.onUpdated.addListener(function(tabId, changeInfo, tab) {
   if (changeInfo.status != 'complete')
     return;
 
   chrome.test.runTests([
     function() {
       // Tests that we can still execute scripts after a frame has loaded after
       // the main document has completed.
-      var injectFrameCode = 'var frame = document.createElement("iframe");' +
-          'frame.src = "' + baseUrl + 'inner.html";' +
-          'frame.onload = function() {chrome.extension.connect().postMessage("loaded")};' +
-          'document.body.appendChild(frame)';
-      var postFrameCode = 'chrome.extension.connect().postMessage("done");';
+      var injectFrameCode =
+          'var frame = document.createElement("iframe");\n' +
+          'frame.src = "' + baseUrl + 'inner.html";\n' +
+          'frame.onload = function() {\n' +
+          '  chrome.runtime.connect().postMessage("loaded");\n' +
+          '};\n' +
+          'document.body.appendChild(frame);';
+      var postFrameCode = 'chrome.runtime.connect().postMessage("done");';
 
-      chrome.extension.onConnect.addListener(function(port) {
+      chrome.runtime.onConnect.addListener(function(port) {
         port.onMessage.addListener(function(data) {
           if (data == 'loaded') {
             chrome.tabs.executeScript(tabId, {code: postFrameCode});
           } else if (data == 'done') {
             chrome.test.succeed();
           }
         });
       });
       chrome.tabs.executeScript(tabId, {code: injectFrameCode});
     }
   ]);
 });
 
 chrome.test.getConfig(function(config) {
   baseUrl = baseUrl.replace(/PORT/, config.testServer.port);
   chrome.tabs.create({ url: baseUrl + 'outer.html' });
 });