Migrate Chrome OS Bluetooth UI to the new discovery API.

chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js

 // Copyright (c) 2012 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.
 
 cr.define('options', function() {
   /** @const */ var OptionsPage = options.OptionsPage;
 
   /**
    * Encapsulated handling of the Bluetooth options page.
    * @constructor
@@ skipping 16 matching lines @@
      * @private
      */
     deviceList_: null,
 
     /** @override */
     initializePage: function() {
       OptionsPage.prototype.initializePage.call(this);
       this.createDeviceList_();
 
       $('bluetooth-add-device-cancel-button').onclick = function(event) {
-        chrome.send('stopBluetoothDeviceDiscovery');
         OptionsPage.closeOverlay();
       };
 
       var self = this;
       $('bluetooth-add-device-apply-button').onclick = function(event) {
         var device = self.deviceList_.selectedItem;
         var address = device.address;
-        chrome.send('stopBluetoothDeviceDiscovery');
         OptionsPage.closeOverlay();
         device.pairing = 'bluetoothStartConnecting';
         options.BluetoothPairing.showDialog(device);
         chrome.send('updateBluetoothDevice', [address, 'connect']);
       };
 
       $('bluetooth-unpaired-devices-list').addEventListener('change',
                                                             function() {
         var item = $('bluetooth-unpaired-devices-list').selectedItem;
         // The "bluetooth-add-device-apply-button" should be enabled for devices
         // that can be paired or remembered. Devices not supporting pairing will
         // be just remembered and later reported as "item.paired" = true. The
         // button should be disabled in any other case:
         // * No item is selected (item is undefined).
         // * Paired devices (item.paired is true) are already paired and a new
         //   pairing attempt will fail. Paired devices could appear in this list
         //   shortly after the pairing initiated in another window finishes.
         // * "Connecting" devices (item.connecting is true) are in the process
         //   of a pairing or connection. Another attempt to pair before the
         //   ongoing pair finishes will fail, so the button should be disabled.
         var disabled = !item || item.paired || item.connecting;
         $('bluetooth-add-device-apply-button').disabled = disabled;
       });
     },
 
+    /** @override */
+    didClosePage: function() {
+      chrome.send('stopBluetoothDeviceDiscovery');
+    },
+
     /**
      * Creates, decorates and initializes the bluetooth device list.
      * @private
      */
     createDeviceList_: function() {
       this.deviceList_ = $('bluetooth-unpaired-devices-list');
       options.system.bluetooth.BluetoothDeviceList.decorate(this.deviceList_);
     }
   };
 
   /**
    * Automatically start the device discovery process if the
    * "Add device" dialog is visible.
    */
   BluetoothOptions.updateDiscovery = function() {
     var page = BluetoothOptions.getInstance();
     if (page && page.visible)
       chrome.send('findBluetoothDevices');
   }
 
   // Export
   return {
     BluetoothOptions: BluetoothOptions
   };
 });