Fix bug with context menus in incognito mode.

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

+// Copyright (c) 2010 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.
+
+var inIncognitoContext = chrome.extension.inIncognitoContext;
+var incognitoStr = inIncognitoContext ? "incognito" : "regular";
+
+function onclick(info) {
+  chrome.test.sendMessage("onclick fired " + incognitoStr);
+}
+
+window.onload = function() {
+  chrome.contextMenus.create({title: "item " + incognitoStr,
+                              onclick: onclick}, function() {
+    if (!chrome.extension.lastError) {
+      chrome.test.sendMessage("created item " + incognitoStr);
+    }
+  });
+};