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

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

Index: chrome/test/data/webui/settings/zoom_levels_tests.js
diff --git a/chrome/test/data/webui/settings/zoom_levels_tests.js b/chrome/test/data/webui/settings/zoom_levels_tests.js
index a688b6621a50b22b46b264a7679e7eb4cc4ccb66..82d79ff13f257abfcc75ce6f5b1de172e99e4c23 100644
--- a/chrome/test/data/webui/settings/zoom_levels_tests.js
+++ b/chrome/test/data/webui/settings/zoom_levels_tests.js
@@ -41,12 +41,6 @@ cr.define('zoom_levels', function() {
           },
       ];
 
-      // 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;