Migrate Chrome OS Bluetooth UI to the new discovery API.

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

Index: chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
diff --git a/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js b/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
index 3b076a1f26fb42e79028bd965ffc7db1a1b03073..4bc7f6cda75e0bc256013b44d90015c97ed73f49 100644
--- a/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
+++ b/chrome/browser/resources/options/chromeos/bluetooth_add_device_overlay.js
@@ -34,7 +34,6 @@ cr.define('options', function() {
       this.createDeviceList_();
 
       $('bluetooth-add-device-cancel-button').onclick = function(event) {
-        chrome.send('stopBluetoothDeviceDiscovery');
         OptionsPage.closeOverlay();
       };
 
@@ -42,7 +41,6 @@ cr.define('options', function() {
       $('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);
@@ -68,6 +66,11 @@ cr.define('options', function() {
       });
     },
 
+    /** @override */
+    didClosePage: function() {
+      chrome.send('stopBluetoothDeviceDiscovery');
+    },
+
     /**
      * Creates, decorates and initializes the bluetooth device list.
      * @private