Fix a failure in test_api.js when accessibility auditing is not enabled.

chrome/test/data/webui/test_api.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.
 
 /**
  * @fileoverview Library providing basic test framework functionality.
  */
 
 /**
  * Namespace for |Test|.
@@ skipping 132 matching lines @@
      * @type {axs.AuditConfiguration}
      */
     accessibilityAuditConfig_: null,
 
     /**
      * Returns the configuration for the accessibility audit, creating it
      * on-demand.
      * @return {axs.AuditConfiguration}
      */
     get accessibilityAuditConfig() {
-      if (!this.accessibilityAuditConfig_) {
+      // The axs namespace is not available in chromevox tests.
+      // Further, 'window' is not available in unit tests, but since the
+      // accessibility audit library pulls in the closure library,
+      // 'goog.global' has to be present if axs is, so we use that here.
+      if (!this.accessibilityAuditConfig_ &&
+          goog && goog.global && goog.global.axs) {
         this.accessibilityAuditConfig_ = new axs.AuditConfiguration();
 
         this.accessibilityAuditConfig_.showUnsupportedRulesWarning = false;
 
         this.accessibilityAuditConfig_.auditRulesToIgnore = [
             // The "elements with meaningful background image" accessibility
             // audit (AX_IMAGE_01) does not apply, since Chrome doesn't
             // disable background images in high-contrast mode like some
             // browsers do.
             "elementsWithMeaningfulBackgroundImage",
@@ skipping 110 matching lines @@
      * creating mocks and registering handlers).
      * @type {Function}
      */
     preLoad: function() {},
 
     /**
      * Override this method to perform tasks before running your test.
      * @type {Function}
      */
     setUp: function() {
-      // These should be ignored in many of the web UI tests.
-      // user-image-stream and supervised-user-creation-image-stream are
-      // streaming video elements used for capturing a user image so they won't
-      // have captions and should be ignored everywhere.
-      this.accessibilityAuditConfig.ignoreSelectors('videoWithoutCaptions',
-                                                    '.user-image-stream');
-      this.accessibilityAuditConfig.ignoreSelectors(
-          'videoWithoutCaptions', '.supervised-user-creation-image-stream');
+      var auditConfig = this.accessibilityAuditConfig;
+      if (auditConfig) {
+        // These should be ignored in many of the web UI tests.
+        // user-image-stream and supervised-user-creation-image-stream are
+        // streaming video elements used for capturing a user image so they
+        // won't have captions and should be ignored everywhere.
+        auditConfig.ignoreSelectors('videoWithoutCaptions',
+                                    '.user-image-stream');
+        auditConfig.ignoreSelectors(
+            'videoWithoutCaptions', '.supervised-user-creation-image-stream');
+      }
     },
 
     /**
      * Override this method to perform tasks after running your test. If you
      * create a mock class, you must call Mock4JS.verifyAllMocks() in this
      * phase.
      * @type {Function}
      */
     tearDown: function() {
       Mock4JS.verifyAllMocks();
@@ skipping 1495 matching lines @@
   exports.TEST = TEST;
   exports.TEST_F = TEST_F;
   exports.RUNTIME_TEST_F = TEST_F;
   exports.GEN = GEN;
   exports.GEN_INCLUDE = GEN_INCLUDE;
   exports.WhenTestDone = WhenTestDone;
 
   // Import the Mock4JS helpers.
   Mock4JS.addMockSupport(exports);
 })(this);