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

chrome/test/data/panels/context_menu/test.js

Index: chrome/test/data/panels/context_menu/test.js
diff --git a/chrome/test/data/panels/context_menu/test.js b/chrome/test/data/panels/context_menu/test.js
index 17e7902b51b41761dca59750a682cd2ba582e089..1f957900dc89d56fee37bd984a8ccbda02053047 100644
--- a/chrome/test/data/panels/context_menu/test.js
+++ b/chrome/test/data/panels/context_menu/test.js
@@ -10,7 +10,7 @@ function onclick(info) {
 function panelCallback() {
   chrome.contextMenus.create({"title":"Extension Item 1",
                               "onclick": onclick}, function() {
-    if (!chrome.extension.lastError) {
+    if (!chrome.runtime.lastError) {
       chrome.test.sendMessage("created item");
     }
   });