history: add a browser test for confirm dialog focus regression.

chrome/test/data/webui/history_browsertest.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.
 
 GEN('#include "chrome/test/data/webui/history_ui_browsertest.h"');
 
 /** @const */ var TOTAL_RESULT_COUNT = 160;
 /** @const */ var WAIT_TIMEOUT = 200;
 
 /**
@@ skipping 855 matching lines @@
 
   var left = document.createEvent('KeyboardEvent');
   left.initKeyboardEvent('keydown', true, true, window, 'Left');
   assertEquals('Left', left.keyIdentifier);
   expectFalse(visit.dropDown.dispatchEvent(left));
 
   expectEquals(visit.titleLink, document.activeElement);
   testDone();
 });
 
+TEST_F('HistoryWebUIRealBackendTest', 'alertOverlayHasFocus', function() {
+  document.querySelector('input[type=checkbox]').click();
+  $('remove-selected').click();
+  assert($('alertOverlay').contains(document.activeElement));
+  testDone();
+});
+
 /**
  * Fixture for History WebUI testing when deletions are prohibited.
  * @extends {HistoryWebUIRealBackendTest}
  * @constructor
  */
 function HistoryWebUIDeleteProhibitedTest() {}
 
 HistoryWebUIDeleteProhibitedTest.prototype = {
   __proto__: HistoryWebUIRealBackendTest.prototype,
 
@@ skipping 132 matching lines @@
 TEST_F('HistoryWebUIWithSchemesTest', 'groupingWithSchemes', function() {
   // Switch to the week view.
   $('timeframe-filter-week').click();
   waitForCallback('historyResult', function() {
     // Each URL should be organized under a different "domain".
     expectEquals(document.querySelectorAll('.entry').length, 4);
     expectEquals(document.querySelectorAll('.site-domain-wrapper').length, 4);
     testDone();
   });
 });