Enable tests related to the extensions web ui that were flaky.

chrome/browser/ui/webui/extensions/extension_settings_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.
 
 // TODO(dbeam): test for loading upacked extensions?
 
 GEN('#include "chrome/browser/ui/webui/extensions/' +
     'extension_settings_browsertest.h"');
 
 // chrome/test/data/extensions/good.crx's extension ID. good.crx is loaded by
@@ skipping 31 matching lines @@
    * @type {string}
    * @const
    */
   browsePreload: 'chrome://extensions-frame/',
 
   /** @override */
   typedefCppFixture: 'ExtensionSettingsUIBrowserTest',
 
   /** @override */
   setUp: function() {
-    // Make all transitions take 0ms for testing purposes.
-    var noTransitionStyle = document.createElement('style');
-    noTransitionStyle.textContent =
-        '* {' +
-        '  -webkit-transition-duration: 0ms !important;' +
-        '  -webkit-transition-delay: 0ms !important;' +
-        '}';
-    document.querySelector('head').appendChild(noTransitionStyle);
+    this.disableAnimationsAndTransitions();
   },
 
   /**
    * Holds an array of steps that should happen in order during a test.
    * The last step should be |testDone|.
    * @protected {Array<!Function>}
    * */
   steps: [],
 
   /**
@@ skipping 37 matching lines @@
       chrome.developerPrivate.getProfileConfiguration(function(profileInfo) {
         assertFalse(profileInfo.inDeveloperMode);
         next();
       });
     };
     this.steps = [this.waitForPageLoad,
                   checkDevModeIsOff,
                   this.verifyDeveloperModeWorks,
                   testDone];
     this.nextStep();
-  }
+  },
 };
 
 // Verify that developer mode doesn't change behavior when the number of
 // extensions changes.
 TEST_F('ExtensionSettingsWebUITest', 'testDeveloperModeNoExtensions',
        function() {
   this.testDeveloperMode();
 });
 
 TEST_F('ExtensionSettingsWebUITest', 'testEmptyExtensionList', function() {
@@ skipping 116 matching lines @@
   __proto__: ExtensionSettingsWebUITest.prototype,
 
   /** @override */
   testGenPreamble: function() {
     GEN('  InstallGoodExtension();');
     GEN('  InstallErrorsExtension();');
   },
 };
 
 // Often times out on all platforms: http://crbug.com/467528
-TEST_F('AsyncExtensionSettingsWebUITest',
-       'DISABLED_testErrorListButtonVisibility',
+TEST_F('AsyncExtensionSettingsWebUITest', 'testErrorListButtonVisibility',
     function() {
   var testButtonVisibility = function() {
     // 2 extensions are loaded:
     //   The 'good' extension will have 0 errors wich means no error list
     //     buttons.
     //   The 'bad' extension will have >3 manifest errors and <3 runtime errors.
     //     This means 2 buttons: 1 visible and 1 hidden.
     var visibleButtons = document.querySelectorAll(
         '.extension-error-list-show-more > a:not([hidden])');
-    assertEquals(1, visibleButtons.length);
+    expectEquals(1, visibleButtons.length);
     // Visible buttons must be part of the focusRow.
-    assertTrue(visibleButtons[0].hasAttribute('column-type'));
+    expectTrue(visibleButtons[0] &&
+               visibleButtons[0].hasAttribute('column-type'));
 
     var hiddenButtons = document.querySelectorAll(
         '.extension-error-list-show-more > a[hidden]');
-    assertEquals(1, hiddenButtons.length);
+    expectEquals(1, hiddenButtons.length);
     // Hidden buttons must NOT be part of the focusRow.
-    assertFalse(hiddenButtons[0].hasAttribute('column-type'));
+    expectFalse(hiddenButtons[0] &&
+                hiddenButtons[0].hasAttribute('column-type'));
 
     this.nextStep();
   };
 
   this.steps = [this.waitForPageLoad,
                 this.verifyDeveloperModeWorks,
                 testButtonVisibility,
                 testDone];
   this.nextStep();
 });
@@ skipping 99 matching lines @@
 
   /** @override */
   browsePreload: ExtensionSettingsWebUITest.prototype.browsePreload +
       '?options=' + GOOD_CRX_ID,
 };
 
 TEST_F('OptionsDialogExtensionSettingsWebUITest', 'testAccessibility',
        function() {
   this.emptyTestForAccessibility();
 });