Kill bad apps.

chrome/test/data/extensions/platform_apps/app_view/host_app/window.js

+// Copyright 2015 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 addAppViewForExtensionId(guestExtensionId, callback) {
+  var appview = document.createElement('appview');
+  document.getElementById('embedder').appendChild(appview);
+  appview.connect(guestExtensionId, {}, function(success) {
+    callback(success);
+  });
+}
+
+window.onAppCommand = function(cmd, param) {
+  if (cmd === 'EMBED') {
+    addAppViewForExtensionId(param, function(success) {});
+  }
+};