MD WebUI: Remove WebUI test focus hack by moving to interactive ui tests

chrome/test/data/webui/cr_elements/cr_action_menu_test.js

Index: chrome/test/data/webui/cr_elements/cr_action_menu_test.js
diff --git a/chrome/test/data/webui/cr_elements/cr_action_menu_test.js b/chrome/test/data/webui/cr_elements/cr_action_menu_test.js
index 233b3ec167765320673481f5fc7b556fabd4b1d2..6cfa650138258af262bf93a50f68d6d88208bec0 100644
--- a/chrome/test/data/webui/cr_elements/cr_action_menu_test.js
+++ b/chrome/test/data/webui/cr_elements/cr_action_menu_test.js
@@ -2,7 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-/** @fileoverview Tests for cr-action-menu element. */
+/**
+ * @fileoverview Tests for cr-action-menu element. Runs as an interactive UI
+ * test, since many of these tests check focus behavior.
+ */
 suite('CrActionMenu', function() {
   /** @type {?CrActionMenuElement} */
   var menu = null;