MD Settings: split browser tests per-file

chrome/test/data/webui/settings/checkbox_tests.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 Suite of tests for settings-checkbox. */
 cr.define('settings_checkbox', function() {
   function registerTests() {
     suite('SettingsCheckbox', function() {
       /**
        * Checkbox created before each test.
        * @type {SettingsCheckbox}
        */
       var testElement;
 
       /**
        * Pref value used in tests, should reflect checkbox 'checked' attribute.
        * @type {SettingsCheckbox}
        */
       var pref = {
         key: 'test',
         type: chrome.settingsPrivate.PrefType.BOOLEAN,
         value: true
       };
 
-      // Import settings_checkbox.html before running suite.
-      suiteSetup(function() {
-        return PolymerTest.importHtml(
-            'chrome://md-settings/controls/settings_checkbox.html');
-      });
-
       // Initialize a checked settings-checkbox before each test.
       setup(function() {
         PolymerTest.clearBody();
         testElement = document.createElement('settings-checkbox');
         testElement.set('pref', pref);
         document.body.appendChild(testElement);
       });
 
       test('responds to checked attribute', function() {
         assertTrue(testElement.checked);
@@ skipping 44 matching lines @@
         assertTrue(testElement.checked);
         assertEquals(1, prefNum.value);
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });