Revert of [a11y] Bring accessibility-audit up to date: v2.10.0 release.

chrome/test/data/webui/test_api.js

Index: chrome/test/data/webui/test_api.js
diff --git a/chrome/test/data/webui/test_api.js b/chrome/test/data/webui/test_api.js
index 248929b7b12a3db8d7eab93336e763a0ab4fc5de..4c2243ed28bc47fe9da42cd09f92ef429214ac66 100644
--- a/chrome/test/data/webui/test_api.js
+++ b/chrome/test/data/webui/test_api.js
@@ -168,10 +168,15 @@
     /**
      * Returns the configuration for the accessibility audit, creating it
      * on-demand.
-     * @return {!axs.AuditConfiguration}
+     * @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;
@@ -191,10 +196,6 @@
             // TODO(aboxhall): re-enable when crbug.com/267035 is fixed.
             // Until then it's just noise.
             "lowContrastElements",
-
-            // TODO(apacible): re-enable when following issue is fixed.
-            // github.com/GoogleChrome/accessibility-developer-tools/issues/251
-            "tableHasAppropriateHeaders",
         ];
       }
       return this.accessibilityAuditConfig_;
@@ -306,14 +307,17 @@
      * @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');
+      }
     },
 
     /**