MD Settings: Remove unnecessary importHtml() calls in site-settings tests.

chrome/test/data/webui/settings/zoom_levels_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.
 
 /** @fileoverview Suite of tests for zoom-levels. */
 cr.define('zoom_levels', function() {
   function registerTests() {
     suite('ZoomLevels', function() {
       /**
        * A zoom levels category created before each test.
@@ skipping 23 matching lines @@
           {
             origin: 'http://www.chromium.org',
             displayName: 'http://www.chromium.org',
             originForFavicon: 'http://www.chromium.org',
             setting: '',
             source: '',
             zoom: '125%',
           },
       ];
 
-      // Import necessary html before running suite.
-      suiteSetup(function() {
-        return PolymerTest.importHtml(
-           'chrome://md-settings/site_settings/zoom_levels.html');
-      });
-
       setup(function() {
         browserProxy = new TestSiteSettingsPrefsBrowserProxy();
         settings.SiteSettingsPrefsBrowserProxyImpl.instance_ = browserProxy;
         return initPage();
       });
 
       teardown(function() {
         testElement.remove();
         testElement = null;
       });
@@ skipping 40 matching lines @@
           assertEquals("http://www.google.com", args[0]);
         });
       });
     });
   }
 
   return {
     registerTests: registerTests,
   };
 });