Expose Cache Storage API in global window/worker scope

LayoutTests/http/tests/cachestorage/resources/test-helpers.js

Index: LayoutTests/http/tests/cachestorage/resources/test-helpers.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/worker-testharness.js b/LayoutTests/http/tests/cachestorage/resources/test-helpers.js
similarity index 69%
copy from LayoutTests/http/tests/serviceworker/resources/worker-testharness.js
copy to LayoutTests/http/tests/cachestorage/resources/test-helpers.js
index fdf5868e33e2fe35344818ec3f1a2e068b90996d..91110950d568d5cb7b1808fa2c6cb2de947a02de 100644
--- a/LayoutTests/http/tests/serviceworker/resources/worker-testharness.js
+++ b/LayoutTests/http/tests/cachestorage/resources/test-helpers.js
@@ -1,15 +1,3 @@
-/*
- * worker-test-harness should be considered a temporary polyfill around
- * testharness.js for supporting Service Worker based tests. It should not be
- * necessary once the test harness is able to drive worker based tests natively.
- * See https://github.com/w3c/testharness.js/pull/82 for status of effort to
- * update upstream testharness.js. Once the upstreaming is complete, tests that
- * reference worker-test-harness should be updated to directly import
- * testharness.js.
- */
-
-importScripts('/resources/testharness.js');
-
 (function() {
   var next_cache_index = 1;