WebUI: Move test_browser_proxy.js one level up.

chrome/test/data/webui/settings/cups_printer_page_tests.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.
 
 /**
  * @constructor
  * @implements {settings.CupsPrintersBrowserProxy}
- * @extends {settings.TestBrowserProxy}
+ * @extends {TestBrowserProxy}
  */
 var TestCupsPrintersBrowserProxy = function() {
-  settings.TestBrowserProxy.call(this, [
+  TestBrowserProxy.call(this, [
     'getCupsPrintersList',
     'getCupsPrinterManufacturersList',
     'getCupsPrinterModelsList',
     'startDiscoveringPrinters',
     'stopDiscoveringPrinters',
   ]);
 };
 
 TestCupsPrintersBrowserProxy.prototype = {
-  __proto__: settings.TestBrowserProxy.prototype,
+  __proto__: TestBrowserProxy.prototype,
 
   printerList: [],
   manufacturers: [],
   models: [],
 
   /** @override */
   getCupsPrintersList: function() {
     this.methodCalled('getCupsPrintersList');
     return Promise.resolve(this.printerList);
   },
@@ skipping 117 matching lines @@
     MockInteractions.tap(addDialog.$$('.action-button'));
     Polymer.dom.flush();
 
     var modelDialog = dialog.$$('add-printer-manufacturer-model-dialog');
     assertTrue(!!modelDialog);
 
     return cupsPrintersBrowserProxy.whenCalled(
         'getCupsPrinterManufacturersList');
   });
 });