Disable test that is flakily timing out on debug.

chrome/test/data/webui/media_router/media_router_elements_browsertest.js

 // Copyright 2015 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 Runs the Media Router Polymer elements tests. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 98 matching lines @@
 });
 
 TEST_F('MediaRouterElementsBrowserTest',
     'MediaRouterContainerSinkList',
     function() {
   media_router_container_sink_list.registerTests();
   mocha.run();
 });
 
 TEST_F('MediaRouterElementsBrowserTest',
-    'MediaRouterContainerFilter',
+    'DISABLED_MediaRouterContainerFilter',
     function() {
   media_router_container_filter.registerTests();
   mocha.run();
 });
 
 TEST_F('MediaRouterElementsBrowserTest', 'MediaRouterHeader', function() {
   media_router_header.registerTests();
   mocha.run();
 });
 
 TEST_F('MediaRouterElementsBrowserTest',
     'MediaRouterSearchHighlighter',
     function() {
   media_router_search_highlighter.registerTests();
   mocha.run();
 });
 
 TEST_F('MediaRouterElementsBrowserTest', 'MediaRouterRouteDetails', function() {
   route_details.registerTests();
   mocha.run();
 });