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

chrome/test/data/extensions/context_menus/incognito/test.js

Index: chrome/test/data/extensions/context_menus/incognito/test.js
diff --git a/chrome/test/data/extensions/context_menus/incognito/test.js b/chrome/test/data/extensions/context_menus/incognito/test.js
index c64b01a36adb066af595813c26981945f84d9274..499577452fc6a08ad94c85ea6314bfbaa9904c9e 100644
--- a/chrome/test/data/extensions/context_menus/incognito/test.js
+++ b/chrome/test/data/extensions/context_menus/incognito/test.js
@@ -12,7 +12,7 @@ function onclick(info) {
 window.onload = function() {
   chrome.contextMenus.create({title: "item " + incognitoStr,
                               onclick: onclick}, function() {
-    if (!chrome.extension.lastError) {
+    if (!chrome.runtime.lastError) {
       chrome.test.sendMessage("created item " + incognitoStr);
     }
   });