Expose Cache Storage API in global window/worker scope

Source/modules/serviceworkers/CacheStorage.idl

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // See https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#cache-storage
 [
     GarbageCollected,
-    Exposed=ServiceWorker,
+    Exposed=(Window,Worker),
     RuntimeEnabled=ServiceWorkerCache,
     TypeChecking=Interface,
 ] interface CacheStorage {
   [CallWith=ScriptState] Promise<boolean> has(DOMString cacheName);
   [CallWith=ScriptState] Promise<Cache> open(DOMString cacheName);
   [CallWith=ScriptState, ImplementedAs=deleteFunction] Promise<boolean> delete(DOMString cacheName);
   [CallWith=ScriptState] Promise<sequence<DOMString>> keys();
   [CallWith=ScriptState, RaisesException] Promise<Response> match(RequestInfo request, optional CacheQueryOptions options);
 };