Bug 1729460 - Change users of defineLazyServiceGetter(s) to use Services.* where appropriate. r=mossop,webdriver-reviewers,extension-reviewers,whimboo,robwu

Differential Revision: https://phabricator.services.mozilla.com/D124838

browser/base/content/test/plugins/head.js

@@ -13,10 +13,6 @@ ChromeUtils.defineModuleGetter(
   "resource://gre/modules/PromiseUtils.jsm"
 );
 
-XPCOMUtils.defineLazyServiceGetters(this, {
-  uuidGen: ["@mozilla.org/uuid-generator;1", "nsIUUIDGenerator"],
-});
-
 // Various tests in this directory may define gTestBrowser, to use as the
 // default browser under test in some of the functions below.
 /* global gTestBrowser:true */