Enable a11y audits and fix issues for downloads page.

chrome/browser/ui/webui/downloads_ui_browsertest.js

 // Copyright 2013 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/browser/ui/webui/downloads_ui_browsertest.h"');
 
 /** @const */ var TOTAL_RESULT_COUNT = 25;
 
 /**
  * Test C++ fixture for downloads WebUI testing.
@@ skipping 18 matching lines @@
   browsePreload: 'chrome://downloads/',
 
   /** @override */
   typedefCppFixture: 'DownloadsUIBrowserTest',
 
   /** @override */
   testGenPreamble: function() {
     GEN('  SetDeleteAllowed(true);');
   },
 
+  /** @override */
+  runAccessibilityChecks: true,
+
+  /** @override */
+  accessibilityIssuesAreErrors: true,
+
   /**
    * Sends TOTAL_RESULT_COUNT fake downloads to the page. This can't be called
    * in the preLoad, because it requires the global Download object to have
    * been created by the page.
    * @override
    */
   setUp: function() {
     // The entries will begin at 1:00 AM on Sept 2, 2008, and will be spaced
     // two minutes apart.
     var timestamp = new Date(2008, 9, 2, 1, 0).getTime();
@@ skipping 133 matching lines @@
   /** @override */
   typedefCppFixture: 'DownloadsWebUIForSupervisedUsersTest',
 };
 
 // Test UI for supervised users, removing entries should be disabled
 // and removal controls should be hidden.
 TEST_F('DownloadsWebUIForSupervisedUsersTest', 'SupervisedUsers', function() {
   this.testHelper(false, true);
   testDone();
 });