Remove obviously unneeded forward declarations from headers under src/{app,base,net}.

net/socket/socks_client_socket_pool.h

 // Copyright (c) 2010 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_SOCKET_SOCKS_CLIENT_SOCKET_POOL_H_
 #define NET_SOCKET_SOCKS_CLIENT_SOCKET_POOL_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/host_resolver.h"
 #include "net/socket/client_socket_pool_base.h"
 #include "net/socket/client_socket_pool_histograms.h"
 #include "net/socket/client_socket_pool.h"
 
 namespace net {
 
-class ClientSocketFactory;
 class ConnectJobFactory;
 class TCPClientSocketPool;
 class TCPSocketParams;
 
 class SOCKSSocketParams : public base::RefCounted<SOCKSSocketParams> {
  public:
   SOCKSSocketParams(const scoped_refptr<TCPSocketParams>& proxy_server,
                     bool socks_v5, const HostPortPair& host_port_pair,
                     RequestPriority priority, const GURL& referrer);
 
@@ skipping 150 matching lines @@
   PoolBase base_;
 
   DISALLOW_COPY_AND_ASSIGN(SOCKSClientSocketPool);
 };
 
 REGISTER_SOCKET_PARAMS_FOR_POOL(SOCKSClientSocketPool, SOCKSSocketParams);
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SOCKS_CLIENT_SOCKET_POOL_H_