Bug 1519596: Follow-up: Removes Services import because it's a redeclaration. a=merge

toolkit/components/antitracking/test/browser/browser_storageAccessPromiseRejectHandlerUserInteraction.js

@@ -1,5 +1,3 @@
-const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");
-
 AntiTracking.runTest("Storage Access API returns promises that maintain user activation for calling its reject handler",
   // blocking callback
   async _ => {