Dispatch a new event chrome.contextMenus.onClicked.

chrome/test/data/extensions/api_test/context_menus/event_page/test.js

 // Copyright (c) 2012 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.
 
 chrome.test.runTests([
   function stringID() {
     var id1 = chrome.contextMenus.create(
         {"id": "id1", "title": "title1"}, function() {
           chrome.test.assertNoLastError();
           chrome.test.assertEq("id1", id1);
           chrome.contextMenus.remove("id1", chrome.test.callbackPass());
     });
   },
 
   function generatedID() {
     chrome.contextMenus.create(
         {"title": "title2"},
         chrome.test.callbackFail("Extensions using event pages must pass an " +
                                  "id parameter to chrome.contextMenus.create"));
+  },
+
+  function noOnClick() {
+    chrome.contextMenus.create(
+        {"id": "id3", "title": "title3", "onclick": function() {}},
+        chrome.test.callbackFail(
+            "Extensions using event pages cannot pass an onclick parameter " +
+            "to chrome.contextMenus.create. Instead, use the " +
+            "chrome.contextMenus.onClicked event."));
   }
 ]);