content: Cleanup class/struct forward declarations

content/browser/service_worker/service_worker_cache_writer.h

 // Copyright 2015 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_CACHE_WRITER_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CACHE_WRITER_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
 #include <set>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace content {
 
 struct HttpResponseInfoIOBuffer;
-class ServiceWorkerCacheWriterCore;
 class ServiceWorkerResponseReader;
 class ServiceWorkerResponseWriter;
-class ServiceWorkerStorage;
 
 // This class is responsible for possibly updating the ServiceWorker script
 // cache for an installed ServiceWorker main script. If there is no existing
 // cache entry, this class always writes supplied data back to the cache; if
 // there is an existing cache entry, this class only writes supplied data back
 // if there is a cache mismatch.
 //
 // Note that writes done by this class cannot be "short" - ie, if they succeed,
 // they always write all the supplied data back. Therefore completions are
 // signalled with net::Error without a count of bytes written.
@@ skipping 177 matching lines @@
 
   std::unique_ptr<ServiceWorkerResponseReader> compare_reader_;
   std::unique_ptr<ServiceWorkerResponseReader> copy_reader_;
   std::unique_ptr<ServiceWorkerResponseWriter> writer_;
   base::WeakPtrFactory<ServiceWorkerCacheWriter> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_CACHE_WRITER_H_