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

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

Index: chrome/test/data/extensions/context_menus/target_urls/test.js
diff --git a/chrome/test/data/extensions/context_menus/target_urls/test.js b/chrome/test/data/extensions/context_menus/target_urls/test.js
index 9742bfd9edda0ef4b50acf8aa34691bfc7d41256..cad65fac70bb6f2792cca943c93fa80bcf99853f 100644
--- a/chrome/test/data/extensions/context_menus/target_urls/test.js
+++ b/chrome/test/data/extensions/context_menus/target_urls/test.js
@@ -6,7 +6,7 @@ window.onload = function() {
   var patterns = [ "http://*.google.com/*" ];
   chrome.contextMenus.create({"title":"item1", "contexts": ["link"],
                               "targetUrlPatterns": patterns}, function() {
-    if (!chrome.extension.lastError) {
+    if (!chrome.runtime.lastError) {
       chrome.test.sendMessage("created items");
     }
   });