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

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

Index: chrome/test/data/webui/settings/category_default_setting_tests.js
diff --git a/chrome/test/data/webui/settings/category_default_setting_tests.js b/chrome/test/data/webui/settings/category_default_setting_tests.js
index ecd69ce5f74bf8d27a271f8e60c237bce398ef13..12085f7ef064eb300f7f62aae875e0f01eb543a5 100644
--- a/chrome/test/data/webui/settings/category_default_setting_tests.js
+++ b/chrome/test/data/webui/settings/category_default_setting_tests.js
@@ -77,12 +77,6 @@ cr.define('category_default_setting', function() {
         },
       };
 
-      // Import necessary html before running suite.
-      suiteSetup(function() {
-        return PolymerTest.importHtml(
-           'chrome://md-settings/site_settings/category_default_setting.html');
-      });
-
       // Initialize a site-settings-category before each test.
       setup(function() {
         browserProxy = new TestSiteSettingsPrefsBrowserProxy();