net: move udp directory into socket

net/udp/udp_socket.h

-// Copyright (c) 2011 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_UDP_UDP_SOCKET_H_
-#define NET_UDP_UDP_SOCKET_H_
-
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include "net/udp/udp_socket_win.h"
-#elif defined(OS_POSIX)
-#include "net/udp/udp_socket_posix.h"
-#endif
-
-namespace net {
-
-// UDPSocket
-// Accessor API for a UDP socket in either client or server form.
-//
-// Client form:
-// In this case, we're connecting to a specific server, so the client will
-// usually use:
-//       Open(address_family)  // Open a socket.
-//       Connect(address)      // Connect to a UDP server
-//       Read/Write            // Reads/Writes all go to a single destination
-//
-// Server form:
-// In this case, we want to read/write to many clients which are connecting
-// to this server.  First the server 'binds' to an addres, then we read from
-// clients and write responses to them.
-// Example:
-//       Open(address_family)  // Open a socket.
-//       Bind(address/port)    // Binds to port for reading from clients
-//       RecvFrom/SendTo       // Each read can come from a different client
-//                             // Writes need to be directed to a specific
-//                             // address.
-#if defined(OS_WIN)
-typedef UDPSocketWin UDPSocket;
-#elif defined(OS_POSIX)
-typedef UDPSocketPosix UDPSocket;
-#endif
-
-}  // namespace net
-
-#endif  // NET_UDP_UDP_SOCKET_H_