Enable a11y audit for chrome://settings

chrome/browser/ui/webui/options/language_options_browsertest.js

Index: chrome/browser/ui/webui/options/language_options_browsertest.js
diff --git a/chrome/browser/ui/webui/options/language_options_browsertest.js b/chrome/browser/ui/webui/options/language_options_browsertest.js
index eedfeb600b0e8f9e127034a32682eb62113f0e1c..171a6b9133247fd1785e28fb8349c9f6cb9a5722 100644
--- a/chrome/browser/ui/webui/options/language_options_browsertest.js
+++ b/chrome/browser/ui/webui/options/language_options_browsertest.js
@@ -14,6 +14,20 @@ LanguageOptionsWebUITest.prototype = {
 
   /** @override */
   browsePreload: 'chrome://settings-frame/languages',
+
+  /** @override */
+  runAccessibilityChecks: true,
+
+  /** @override */
+  accessibilityIssuesAreErrors: true,
+
+  /** override */
+  setUp: function() {
+    // user-image-stream is a streaming video element used for capturing a
+    // user image.
+    this.accessibilityAuditConfig.ignoreSelectors('videoWithoutCaptions',
+                                                  '.user-image-stream');
+  },
 };
 
 // Test opening language options has correct location.