Remove app_remoting.

remoting/webapp/app_remoting/js/ar_background.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.
-
-/** @type {chrome.app.window.AppWindow} */
-var mainWindow = null;
-
-/**
- * The main window cannot delete its context menu entries on close because it
- * is being torn down at that point and doesn't have access to the necessary
- * APIs. Instead, it notifies the background page of the entries it creates,
- * and the background pages deletes them when the window is closed.
- *
- * @type {!Object}
- */
-var contextMenuIds = {};
-
-/** @param {Object=} opt_launchData */
-function createWindow(opt_launchData) {
-  // If there is already a window, give it focus.
-  if (mainWindow) {
-    mainWindow.focus();
-    return;
-  }
-
-  var typed_screen = /** @type {{availWidth: number, availHeight: number}} */
-      (screen);
-
-  var windowAttributes = {
-    resizable: false,
-    frame: remoting.platformIsMac() ? 'chrome' : 'none',
-    bounds: {
-      width: typed_screen.availWidth,
-      height: typed_screen.availHeight,
-      left: undefined,
-      top: undefined
-    }
-  };
-
-  function onClosed() {
-    mainWindow = null;
-    var ids = Object.keys(contextMenuIds);
-    for (var i = 0; i < ids.length; ++i) {
-      chrome.contextMenus.remove(ids[i]);
-    }
-    contextMenuIds = {};
-  };
-
-  /** @param {chrome.app.window.AppWindow} appWindow */
-  function onCreate(appWindow) {
-    // Set the global window.
-    mainWindow = appWindow;
-
-    // Clean up the windows sub-menu when the application quits.
-    appWindow.onClosed.addListener(onClosed);
-  };
-
-  // TODO(garykac) Add code to switch between dev and prod shared modules.
-  chrome.app.window.create(
-      '_modules/koejkfhmphamcgafjmkellhnekdkopod/main.html',
-      windowAttributes, onCreate);
-};
-
-/** @param {Event} event */
-function onWindowMessage(event) {
-  var method = /** @type {string} */ (event.data['method']);
-  var id = /** @type {string} */ (event.data['id']);
-  switch (method) {
-    case 'addContextMenuId':
-      contextMenuIds[id] = true;
-      break;
-    case 'removeContextMenuId':
-      delete contextMenuIds[id];
-      break;
-  }
-};
-
-chrome.app.runtime.onLaunched.addListener(createWindow);
-window.addEventListener('message', onWindowMessage, false);