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

chrome/test/data/extensions/api_test/incognito/apis/background.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 normalWindow, normalTab;
 var incognitoWindow, incognitoTab;
 
 var pass = chrome.test.callbackPass;
 var fail = chrome.test.callbackFail;
 var assertEq = chrome.test.assertEq;
@@ skipping 74 matching lines @@
 
       var testUrl = "http://localhost:PORT/files/extensions/test_file.html"
           .replace(/PORT/, config.testServer.port);
 
       // Test that chrome.extension.inIncognitoTab is true for incognito tabs.
       chrome.tabs.create({windowId: incognitoWindow.id, url: testUrl},
         pass(function(tab) {
           chrome.tabs.executeScript(tab.id,
             {code: 'document.title = chrome.extension.inIncognitoContext'},
             pass(function() {
-              assertEq(undefined, chrome.extension.lastError);
+              assertEq(undefined, chrome.runtime.lastError);
               chrome.tabs.get(tab.id, pass(function(tab) {
                   assertEq("true", tab.title);
                 }));
             }));
         }));
 
       // ... and false for normal tabs.
       chrome.tabs.create({windowId: normalWindow.id, url: testUrl},
         pass(function(tab) {
           chrome.tabs.executeScript(tab.id,
             {code: 'document.title = chrome.extension.inIncognitoContext'},
             pass(function() {
-              assertEq(undefined, chrome.extension.lastError);
+              assertEq(undefined, chrome.runtime.lastError);
               chrome.tabs.get(tab.id, pass(function(tab) {
                   assertEq("false", tab.title);
                 }));
             }));
         }));
     },
 
     // Tests that extensions can't move tabs between incognito and
     // non-incognito windows.
     function moveTabBetweenProfiles() {
       var errorMsg = "Tabs can only be moved between " +
                        "windows in the same profile.";
 
       // Create a tab in the non-incognito window...
       chrome.tabs.create({windowId: normalWindow.id, url: 'about:blank'},
         pass(function(tab) {
           // ... and then try to move it to the incognito window.
           chrome.tabs.move(tab.id,
             {windowId: incognitoWindow.id, index: 0}, fail(errorMsg));
         }));
     }
   ]);
 });