Hide default context menu for platform apps.

chrome/test/data/extensions/platform_apps/context_menu/test.js

Index: chrome/test/data/extensions/platform_apps/context_menu/test.js
diff --git a/chrome/test/data/extensions/platform_apps/context_menu/test.js b/chrome/test/data/extensions/platform_apps/context_menu/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..71a31a88a2b8e6567e14e663e7c1ea5f22b18f16
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/context_menu/test.js
@@ -0,0 +1,15 @@
+// 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.
+
+function onclick(info) {
+}
+
+window.onload = function() {
+  chrome.contextMenus.create({"title":"Extension Item 1",
+                              "onclick": onclick}, function() {
+    if (!chrome.extension.lastError) {
+      chrome.test.sendMessage("created item");
+    }
+  });
+};