Remove old downloads UI; Material Design version is now the default.

chrome/browser/ui/webui/downloads_ui_supervised_browsertest.js

-// Copyright 2014 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.
-
-GEN_INCLUDE(['downloads_ui_browsertest_base.js']);
-GEN('#include "chrome/browser/ui/webui/downloads_ui_supervised_browsertest.h"');
-
-/**
- * Fixture for Downloads WebUI testing for a supervised user.
- * @extends {BaseDownloadsWebUITest}
- * @constructor
- */
-function DownloadsWebUIForSupervisedUsersTest() {}
-
-DownloadsWebUIForSupervisedUsersTest.prototype = {
-  __proto__: BaseDownloadsWebUITest.prototype,
-
-  /** @override */
-  typedefCppFixture: 'DownloadsWebUIForSupervisedUsersTest',
-};
-
-// Test UI for supervised users, removing entries should be disabled
-// and removal controls should be hidden.
-TEST_F('DownloadsWebUIForSupervisedUsersTest', 'SupervisedUsers', function() {
-  this.expectDeleteControlsVisible(false);
-  testDone();
-});