Refactor tcp socket and unix domain socket.

net/socket/server_socket.cc

+// 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.
+
+#include "net/socket/server_socket.h"
+
+#include "net/base/ip_endpoint.h"
+#include "net/base/net_errors.h"
+#include "net/base/net_util.h"
+
+namespace net {
+
+ServerSocket::ServerSocket() {
+}
+
+ServerSocket::~ServerSocket() {
+}
+
+int ServerSocket::ListenWithAddressAndPort(const std::string& address_string,
+                                           int port,
+                                           int backlog) {
+  IPAddressNumber address_number;
+  if (!ParseIPLiteralToNumber(address_string, &address_number)) {
+    return ERR_ADDRESS_INVALID;
+  }
+
+  return Listen(IPEndPoint(address_number, port), backlog);
+}
+
+}  // namespace net