Switch platform apps from a declarative launch container to handling an onLaunched event.

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

Index: chrome/test/data/extensions/platform_apps/empty_context_menu/test.js
diff --git a/chrome/test/data/extensions/platform_apps/empty_context_menu/test.js b/chrome/test/data/extensions/platform_apps/empty_context_menu/test.js
new file mode 100644
index 0000000000000000000000000000000000000000..6793a0f05a14e4ba8fa3d7138a43a97bb5a40c0d
--- /dev/null
+++ b/chrome/test/data/extensions/platform_apps/empty_context_menu/test.js
@@ -0,0 +1,10 @@
+// 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.experimental.runtime.onLaunched.addListener(function() {
+  chrome.windows.create({
+      url: 'main.html',
+      type: 'shell'
+  });
+});