MD Settings: combine title and ways of closing Bluetooth device dialog

chrome/test/data/webui/settings/bluetooth_page_browsertest_chromeos.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 Suite of tests for settings-bluetooth-page. */
 
 GEN_INCLUDE(['settings_page_browsertest.js']);
 
 var bluetoothPage = bluetoothPage || {};
 
@@ skipping 163 matching lines @@
       MockInteractions.tap(devices[0].$$('div'));
       Polymer.dom.flush();
       // Ensure the pairing dialog is shown.
       assertTrue(!!dialog.$$('#pairing'));
       // Ensure the device is connected to.
       expectEquals(1, self.bluetoothPrivateApi_.connectedDevices_.size);
       var deviceAddress =
           self.bluetoothPrivateApi_.connectedDevices_.keys().next().value;
 
       // Close the dialog.
-      var close = dialog.$$('#closePair');
+      var close = dialog.$.dialog.getCloseButton();
       assertTrue(!!close);
       MockInteractions.tap(close);
       Polymer.dom.flush();
       expectFalse(dialog.$.dialog.opened);
       var response = self.bluetoothPrivateApi_.pairingResponses_[deviceAddress];
       assertTrue(!!response);
       expectEquals(chrome.bluetoothPrivate.PairingResponse.CANCEL,
                    response.response);
     });
   });
 
   // Run all registered tests.
   mocha.run();
 });