bluetooth: Componentize device list fixes

chrome/browser/resources/bluetooth_internals/interfaces.js

 // Copyright 2016 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.
 
 /**
  * Javascript for Mojo interface helpers, served from
  *     chrome://bluetooth-internals/.
  */
 
 cr.define('interfaces', function() {
   /**
-   * Imports Mojo interfaces and adds them to window.interfaces.
+   * Sets up Mojo interfaces and adds them to window.interfaces.
    * @return {Promise}
    */
-  function importInterfaces() {
+  function setupInterfaces() {
     return importModules([
       'content/public/renderer/frame_interfaces',
       'device/bluetooth/public/interfaces/adapter.mojom',
       'device/bluetooth/public/interfaces/device.mojom',
       'mojo/public/js/connection',
     ]).then(function([frameInterfaces, bluetoothAdapter, bluetoothDevice,
         connection]) {
-      Object.assign(interfaces, {
-        BluetoothAdapter: bluetoothAdapter,
-        BluetoothDevice: bluetoothDevice,
-        Connection: connection,
-        FrameInterfaces: frameInterfaces,
-      });
+      interfaces.BluetoothAdapter = bluetoothAdapter;
+      interfaces.BluetoothDevice = bluetoothDevice;
+      interfaces.Connection = connection;
+      interfaces.FrameInterfaces = frameInterfaces;
     });
   }
 
   return {
-    BluetoothAdapter: {},
-    BluetoothDevice: {},
-    Connection: {},
-    FrameInterfaces: {},
-    importInterfaces: importInterfaces,
+    setupInterfaces: setupInterfaces,
   };
 });