Revert of Disable many tests with flaky accessibility audits.

chrome/browser/ui/webui/options/multilanguage_options_webui_browsertest.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.
 
 GEN_INCLUDE(['options_browsertest_base.js']);
 GEN('#include "chrome/browser/ui/webui/options/' +
     'multilanguage_options_browsertest.h"');
 
 /**
  * Test C++ fixture for Language Options WebUI testing.
@@ skipping 173 matching lines @@
 
     // Enable when failure is resolved.
     // AX_FOCUS_01: http://crbug.com/570046
     this.accessibilityAuditConfig.ignoreSelectors(
         'focusableElementNotVisibleAndNotAriaHidden',
         '#offer-to-translate-in-this-language');
   },
 };
 
 // Make sure the case where no languages are selected is handled properly.
-// TODO(crbug.com/657514) Flakes on linux and chromeos.
-GEN('#if defined(OS_LINUX) || defined(OS_CHROMEOS)');
-GEN('#define MAYBE_SelectFromBlank DISABLED_SelectFromBlank');
-GEN('#else');
-GEN('#define MAYBE_SelectFromBlank SelectFromBlank');
-GEN('#endif  // defined(OS_WIN)');
-TEST_F('MultilanguagePreferenceWebUIBrowserTest', 'MAYBE_SelectFromBlank',
+TEST_F('MultilanguagePreferenceWebUIBrowserTest', 'SelectFromBlank',
        function() {
   expectTrue($('language-options-list').selectLanguageByCode('fr'));
   expectFalse($('spellcheck-language-checkbox').checked, 'fr');
   expectTrue($('edit-custom-dictionary-button').hidden);
 
   // Add a preference change event listener which ensures that the preference is
   // updated correctly and that 'fr' is the only thing in the dictionary object.
   this.addPreferenceListener('spellcheck.dictionaries', function() {
     expectTrue($('spellcheck-language-checkbox').checked, 'fr');
     this.expectRegisteredDictionariesPref('fr');
     this.expectCurrentlySelected('fr');
     expectFalse($('edit-custom-dictionary-button').hidden);
     testDone();
   }.bind(this));
 
   // Click 'fr' and trigger the preference listener.
   $('spellcheck-language-checkbox').click();
 });