content: Cleanup class/struct forward declarations

content/browser/service_worker/service_worker_version.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <stdint.h>
 
 #include <functional>
@@ skipping 36 matching lines @@
 #ifdef SendMessage
 #undef SendMessage
 #endif
 
 namespace net {
 class HttpResponseInfo;
 }
 
 namespace content {
 
-class EmbeddedWorkerRegistry;
 class ServiceWorkerContextCore;
 class ServiceWorkerProviderHost;
 class ServiceWorkerRegistration;
 class ServiceWorkerURLRequestJob;
 struct ServiceWorkerClientInfo;
 struct ServiceWorkerVersionInfo;
 
 // This class corresponds to a specific version of a ServiceWorker
 // script for a given pattern. When a script is upgraded, there may be
 // more than one ServiceWorkerVersion "running" at a time, but only
@@ skipping 828 matching lines @@
 
   // At this point |this| can have been deleted, so don't do anything other
   // than returning.
 
   return true;
 }
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_