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

net/http/http_proxy_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_HTTP_HTTP_PROXY_CLIENT_SOCKET_POOL_H_
 #define NET_HTTP_HTTP_PROXY_CLIENT_SOCKET_POOL_H_
 #pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "net/base/host_port_pair.h"
 #include "net/http/http_auth.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 HostResolver;
-class HttpAuthController;
 class HttpNetworkSession;
 class TCPClientSocketPool;
 class TCPSocketParams;
 
 class HttpProxySocketParams : public base::RefCounted<HttpProxySocketParams> {
  public:
   HttpProxySocketParams(const scoped_refptr<TCPSocketParams>& proxy_server,
                         const GURL& request_url,
                         const std::string& user_agent,
                         HostPortPair endpoint,
@@ skipping 164 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(HttpProxyClientSocketPool);
 };
 
 REGISTER_SOCKET_PARAMS_FOR_POOL(HttpProxyClientSocketPool,
                                 HttpProxySocketParams);
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_PROXY_CLIENT_SOCKET_POOL_H_