Revert "comment out imports"

This reverts commit 57caf91.

Author: Feiyang1

packages/analytics/src/factory.ts

@@ -38,12 +38,12 @@ import { ANALYTICS_ID_FIELD } from './constants';
 import { AnalyticsError, ERROR_FACTORY } from './errors';
 import { FirebaseApp } from '@firebase/app-types';
 import { FirebaseInstallations } from '@firebase/installations-types';
-// import {
-//   isIndexedDBAvailable,
-//   validateIndexedDBOpenable,
-//   areCookiesEnabled,
-//   isBrowserExtension
-// } from '@firebase/util';
+import {
+  isIndexedDBAvailable,
+  validateIndexedDBOpenable,
+  areCookiesEnabled,
+  isBrowserExtension
+} from '@firebase/util';
 
 /**
  * Maps gaId to FID fetch promises.