WebUI: Move test_browser_proxy.js one level up.

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

 // Copyright 2016 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_default_browser', function() {
   /**
    * A test version of DefaultBrowserBrowserProxy. Provides helper methods
    * for allowing tests to know when a method was called, as well as
    * specifying mock responses.
    *
    * @constructor
    * @implements {settings.DefaultBrowserBrowserProxy}
-   * @extends {settings.TestBrowserProxy}
+   * @extends {TestBrowserProxy}
    */
   var TestDefaultBrowserBrowserProxy = function() {
-    settings.TestBrowserProxy.call(this, [
+    TestBrowserProxy.call(this, [
       'requestDefaultBrowserState',
       'setAsDefaultBrowser',
     ]);
 
     /** @private {!DefaultBrowserInfo} */
     this.defaultBrowserInfo_ = {
       canBeDefault: true,
       isDefault: false,
       isDisabledByPolicy: false,
       isUnknownError: false
     };
   };
 
   TestDefaultBrowserBrowserProxy.prototype = {
-    __proto__: settings.TestBrowserProxy.prototype,
+    __proto__: TestBrowserProxy.prototype,
 
     /** @override */
     requestDefaultBrowserState: function() {
       this.methodCalled('requestDefaultBrowserState');
       return Promise.resolve(this.defaultBrowserInfo_);
     },
 
     /** @override */
     setAsDefaultBrowser: function() {
       this.methodCalled('setAsDefaultBrowser');
@@ skipping 122 matching lines @@
       });
     });
   }
 
   return {
     registerTests: function() {
       registerDefaultBrowserPageTests();
     },
   };
 });