Expose Cache Storage API in global window/worker scope

LayoutTests/http/tests/cachestorage/script-tests/cache-delete.js

Index: LayoutTests/http/tests/cachestorage/script-tests/cache-delete.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/cache-delete-worker.js b/LayoutTests/http/tests/cachestorage/script-tests/cache-delete.js
similarity index 95%
copy from LayoutTests/http/tests/serviceworker/resources/cache-delete-worker.js
copy to LayoutTests/http/tests/cachestorage/script-tests/cache-delete.js
index 98204fddf96e73ec4f14155b08055a4e6833b0dc..a6db4c1851ad72a55ae34772f199056cc23cedaf 100644
--- a/LayoutTests/http/tests/serviceworker/resources/cache-delete-worker.js
+++ b/LayoutTests/http/tests/cachestorage/script-tests/cache-delete.js
@@ -1,5 +1,8 @@
-importScripts('worker-testharness.js');
-importScripts('/resources/testharness-helpers.js');
+if (self.importScripts) {
+    importScripts('/resources/testharness.js');
+    importScripts('/resources/testharness-helpers.js');
+    importScripts('../resources/test-helpers.js');
+}
 
 var test_url = 'https://example.com/foo';
 
@@ -114,3 +117,5 @@ function prepopulated_cache_test(test_function, description) {
           });
     }, description);
 }
+
+done();