MD Settings: Use a browser proxy from the languages page. Re-enable test.

chrome/test/data/webui/settings/cr_settings_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 Polymer Settings tests. */
 
 /** @const {string} Path to source root. */
 var ROOT_PATH = '../../../../../';
 
 // Polymer BrowserTest fixture.
@@ skipping 1072 matching lines @@
 
   /** @override */
   browsePreload: 'chrome://md-settings/languages_page/languages.html',
 
   /** @override */
   extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
     '../fake_chrome_event.js',
     'test_browser_proxy.js',
     'fake_language_settings_private.js',
     'fake_settings_private.js',
+    'fake_input_method_private.js',
     'languages_tests.js',
   ]),
 };
 
 // Flaky on Win and Linux, see http://crbug/692356.
-TEST_F('CrSettingsLanguagesTest', 'DISABLED_Languages', function() {
+TEST_F('CrSettingsLanguagesTest', 'Languages', function() {
   mocha.run();
 });
 
 /**
  * @constructor
  * @extends {CrSettingsBrowserTest}
  */
 function CrSettingsRouteTest() {}
 
 CrSettingsRouteTest.prototype = {
@@ skipping 313 matching lines @@
   extraLibraries: CrSettingsBrowserTest.prototype.extraLibraries.concat([
     'test_browser_proxy.js',
     'test_extension_control_browser_proxy.js',
     'extension_controlled_indicator_tests.js',
   ]),
 };
 
 TEST_F('CrSettingsExtensionControlledIndicatorTest', 'All', function() {
   mocha.run();
 });