Bug 1843796 - Part 1: Remove unused imports for services/common/hawkclient.sys.mjs in html/xhtml. r=markh

Depends on D183692

Differential Revision: https://phabricator.services.mozilla.com/D183693

services/fxaccounts/tests/mochitest/test_invalidEmailCase.html

@@ -27,7 +27,6 @@ SimpleTest.waitForExplicitFinish();
 
 const {FxAccounts} = ChromeUtils.import("resource://gre/modules/FxAccounts.jsm");
 const {FxAccountsClient} = ChromeUtils.import("resource://gre/modules/FxAccountsClient.jsm");
-ChromeUtils.import("resource://services-common/hawkclient.js");
 
 const TEST_SERVER =
   "http://mochi.test:8888/chrome/services/fxaccounts/tests/mochitest/file_invalidEmailCase.sjs?path=";