Remove mojo/apps/js, it is unused

mojo/apps/js/mojo.js

-// Copyright 2014 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.
-
-define("mojo/apps/js/mojo", [
-  "mojo/public/js/bindings/connection",
-  "mojo/apps/js/bridge",
-], function(connection, mojo) {
-
-  function connectToService(url, service, client) {
-    var serviceHandle = mojo.connectToService(url, service.name);
-    var clientClass = client && service.client.delegatingStubClass;
-    var serviceConnection =
-      new connection.Connection(serviceHandle, clientClass, service.proxyClass);
-    if (serviceConnection.local)
-      serviceConnection.local.delegate$ = client;
-    serviceConnection.remote.connection$ = serviceConnection;
-    return serviceConnection.remote;
-  }
-
-  var exports = {};
-  exports.connectToService = connectToService;
-  exports.quit = mojo.quit;
-  return exports;
-});
-