MD Settings: Bluetooth: Make top level UI consistent

chrome/browser/resources/settings/bluetooth_page/bluetooth_page.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
  * 'settings-bluetooth-page' is the settings page for managing bluetooth
  *  properties and devices.
  *
  * Example:
@@ skipping 554 matching lines @@
     this.startDiscovery_();
   },
 
   /** @private */
   onDialogClosed_: function() {
     this.stopDiscovery_();
     this.dialogId_ = '';
     this.pairingDevice_ = null;
     this.pairingEvent_ = null;
   },
+
+  /** @private */
+  doNothing_: function() {
+    event.stopPropagation();
+  },
 });