Delete common-test-setup-karma.ts

All it's workarounds have been unnecessary and removed.

Release-Notes: skip
Change-Id: I39cb711151555f735a5014f36941ebd886c21a2d
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
index ca6dfc1..af67b2a 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.ts
@@ -3,7 +3,7 @@
  * Copyright 2017 Google LLC
  * SPDX-License-Identifier: Apache-2.0
  */
-import '../../../test/common-test-setup-karma';
+import '../../../test/common-test-setup';
 import './gr-router';
 import {page} from '../../../utils/page-wrapper-utils';
 import {GerritNav, WeblinkType} from '../gr-navigation/gr-navigation';