net: Cleanup class/struct forward declarations

net/http/http_server_properties_manager.h

 // 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.
 
 #ifndef NET_HTTP_HTTP_SERVER_PROPERTIES_MANAGER_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/timer/timer.h"
 #include "base/values.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/net_export.h"
 #include "net/http/http_server_properties.h"
 #include "net/http/http_server_properties_impl.h"
 
-class PrefService;
-
 namespace base {
 class SequencedTaskRunner;
 }
 
 namespace net {
 
 class IPAddress;
 
 ////////////////////////////////////////////////////////////////////////////////
 // HttpServerPropertiesManager
@@ skipping 270 matching lines @@
   // Used to get |weak_ptr_| to self on the network thread.
   std::unique_ptr<base::WeakPtrFactory<HttpServerPropertiesManager>>
       network_weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HttpServerPropertiesManager);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_MANAGER_H_