Fix typo in type declaration

chrome/test/data/webui/settings/fake_bluetooth.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.
 
 /**
  * @fileoverview Fake implementation of chrome.bluetooth for testing.
  */
 cr.define('settings', function() {
   /**
    * Fake of the chrome.bluetooth API.
    * @constructor
    * @implements {Bluetooth}
    */
   function FakeBluetooth() {
-    /** @type {!chrome.bluettoth.AdapterState} */ this.adapterState = {
+    /** @type {!chrome.bluetooth.AdapterState} */ this.adapterState = {
       address: '00:11:22:33:44:55:66',
       name: 'Fake Adapter',
       powered: false,
       available: true,
       discovering: false
     };
 
     /** @type {!Array<!chrome.bluetooth.Device>} */ this.devices = [];
   }
 
@@ skipping 50 matching lines @@
 
     /** @override */
     onDeviceChanged: new FakeChromeEvent(),
 
     /** @override */
     onDeviceRemoved: new FakeChromeEvent(),
   };
 
   return {FakeBluetooth: FakeBluetooth};
 });