MD Settings: Update Bluetooth toggle UI to match spec.

chrome/browser/resources/settings/bluetooth_page/bluetooth_subpage.js

 // Copyright 2017 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
  * 'settings-bluetooth-subpage' is the settings subpage for managing bluetooth
  *  properties and devices.
  */
 
@@ skipping 330 matching lines @@
       this.connectDevice_(device);
     else if (action == 'disconnect')
       this.disconnectDevice_(device);
     else if (action == 'remove')
       this.forgetDevice_(device);
     else
       console.error('Unexected action: ' + action);
   },
 
   /**
+   * @param {boolean} enabled
+   * @param {string} onstr
+   * @param {string} offstr
    * @return {string}
    * @private
    */
-  getOffOnString_: function() {
-    return this.i18n(this.bluetoothEnabled ? 'bluetoothOn' : 'bluetoothOff');
+  getOnOffString_: function(enabled, onstr, offstr) {
+    return enabled ? onstr : offstr;
   },
 
   /**
    * @param {boolean} bluetoothEnabled
    * @param {!Array<!chrome.bluetooth.Device>} deviceList
    * @return {boolean}
    * @private
    */
   showDevices_: function(bluetoothEnabled, deviceList) {
     return bluetoothEnabled && deviceList.length > 0;
@@ skipping 98 matching lines @@
     Polymer.dom.flush();
     this.$.deviceDialog.open();
   },
 
   /** @private */
   onDialogClosed_: function() {
     this.dialogId_ = '';
     this.pairingDevice_ = undefined;
   },
 });