Set a max limit on extension items' labels in context menus....

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

Index: chrome/test/data/extensions/context_menus/simple/test.js
===================================================================
--- chrome/test/data/extensions/context_menus/simple/test.js	(revision 54510)
+++ chrome/test/data/extensions/context_menus/simple/test.js	(working copy)
@@ -2,33 +2,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Checks that there is only one window and one tab, and calls back |callback|
-// with its id (or -1 if there is more than 1 window or more than 1 tab).
-function getCurrentSingleTabId(callback) {
-  chrome.windows.getAll({"populate":true}, function(windows) {
-    if (windows.length != 1 || windows[0].tabs.length != 1) {
-      callback(-1);
-    } else {
-      callback(windows[0].tabs[0].id);
-    }
-  });
-}
-
-function navigateCurrentTab(url) {
-  getCurrentSingleTabId(function(tabid) {
-    chrome.tabs.update(tabid, {"url": url});
-  });
-}
-
 function onclick(info) {
-  navigateCurrentTab(chrome.extension.getURL("test2.html"));
+  chrome.test.sendMessage("onclick fired");
 }
 
 window.onload = function() {
   chrome.contextMenus.create({"title":"Extension Item 1",
                               "onclick": onclick}, function() {
     if (!chrome.extension.lastError) {
-      navigateCurrentTab(chrome.extension.getURL("test.html"));
+      chrome.test.sendMessage("created item");
     }
   });
 };