Expose Cache Storage API in global window/worker scope

LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js

Index: LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js b/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
similarity index 84%
copy from LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js
copy to LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
index 80840a0c4c94fbe99b26998b61638fc002430c08..51b06c3d4fb9f432b41d5921c662a61b2ca610e4 100644
--- a/LayoutTests/http/tests/serviceworker/resources/cache-storage-keys-worker.js
+++ b/LayoutTests/http/tests/cachestorage/script-tests/cache-storage-keys.js
@@ -1,6 +1,8 @@
-importScripts('worker-testharness.js');
-importScripts('../../resources/testharness-helpers.js');
-importScripts('override_assert_object_equals.js');
+if (self.importScripts) {
+    importScripts('/resources/testharness.js');
+    importScripts('/resources/testharness-helpers.js');
+    importScripts('../resources/test-helpers.js');
+}
 
 var test_cache_list =
   ['', 'example', 'Another cache name', 'A', 'a', 'ex ample'];
@@ -30,3 +32,5 @@ promise_test(function(test) {
                               'existing caches.');
         });
   }, 'CacheStorage keys');
+
+done();