WebUI: Move test_browser_proxy.js one level up.

chrome/test/data/webui/settings/test_languages_browser_proxy.js

 // Copyright 2017 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.
 
 cr.define('settings', function() {
   /**
    * @constructor
    * @implements {settings.LanguagesBrowserProxy}
-   * @extends {settings.TestBrowserProxy}
+   * @extends {TestBrowserProxy}
    */
   var TestLanguagesBrowserProxy = function() {
     var methodNames = [];
     if (cr.isChromeOS || cr.isWindows)
       methodNames.push('getProspectiveUILanguage');
 
-    settings.TestBrowserProxy.call(this, methodNames);
+    TestBrowserProxy.call(this, methodNames);
 
     /** @private {!LanguageSettingsPrivate} */
     this.languageSettingsPrivate_ = new settings.FakeLanguageSettingsPrivate();
 
     /** @private {!InputMethodPrivate} */
     this.inputMethodPrivate_ = new settings.FakeInputMethodPrivate();
   };
 
   TestLanguagesBrowserProxy.prototype = {
-    __proto__: settings.TestBrowserProxy.prototype,
+    __proto__: TestBrowserProxy.prototype,
 
     /** @override */
     getLanguageSettingsPrivate: function() {
       return this.languageSettingsPrivate_;
     },
 
     /** @override */
     getInputMethodPrivate: function() {
       return this.inputMethodPrivate_;
     },
   };
 
   if (cr.isChromeOS || cr.isWindows) {
     /** @override */
     TestLanguagesBrowserProxy.prototype.getProspectiveUILanguage =
         function() {
       this.methodCalled('getProspectiveUILanguage');
       return Promise.resolve('en-US');
     };
   }
 
   return {
     TestLanguagesBrowserProxy: TestLanguagesBrowserProxy,
   };
 });