Fix enable a11y tests for History and fix failures

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 125 matching lines @@
   __proto__: testing.Test.prototype,
 
   /**
    * Browse to the history page & call our preLoad().
    */
   browsePreload: 'chrome://history-frame',
 
   /** @override */
   typedefCppFixture: 'HistoryUIBrowserTest',
 
+  /** @override */
+  runAccessibilityChecks: true,
+
+  /** @override */
+  accessibilityIssuesAreErrors: true,
+
   isAsync: true,
 };
 
 /**
  * Fixture for History WebUI testing which returns some fake history results
  * to the frontend. Other fixtures that want to stub out calls to the backend
  * can extend this one.
  * @extends {BaseHistoryWebUITest}
  * @constructor
  */
@@ skipping 856 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();
   });
 });