Print Preview: Make useCloudPrint a WebUI event

chrome/test/data/webui/print_preview/print_preview_tests.js

 // Copyright 2016 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('print_preview_test', function() {
   /**
    * Index of the "Save as PDF" printer.
    * @type {number}
    * @const
    */
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             'BarName',
             localList.childNodes.item(BAR_INDEX).
             querySelector('.destination-list-item-name').textContent);
       });
     });
 
     // Test that the printer list is structured correctly after calling
     // addCloudPrinters with an empty list.
     test('PrinterListCloudEmpty', function() {
       return setupSettingsAndDestinationsWithCapabilities().then(function() {
-        var cloudPrintEnableEvent = new Event(
-            print_preview.NativeLayer.EventType.CLOUD_PRINT_ENABLE);
-        cloudPrintEnableEvent.baseCloudPrintUrl = 'cloudprint url';
-        nativeLayer.getEventTarget().dispatchEvent(
-            cloudPrintEnableEvent);
-
+        cr.webUIListenerCallback('use-cloud-print', 'cloudprint url', false);
         var searchDoneEvent =
             new Event(cloudprint.CloudPrintInterfaceEventType.SEARCH_DONE);
         searchDoneEvent.printers = [];
         searchDoneEvent.isRecent = true;
         searchDoneEvent.email = 'foo@chromium.org';
         printPreview.cloudPrintInterface_.dispatchEvent(searchDoneEvent);
 
         var recentList =
             $('destination-search').querySelector('.recent-list ul');
         var localList =
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       return setupSettingsAndDestinationsWithCapabilities().then(function() {
         // The system default destination should be used instead of the
         // most recent destination.
         assertEquals(
             'FooDevice',
             printPreview.destinationStore_.selectedDestination.id);
       });
     });
   });
 });