Revert of net: merge two versions of SetTCPNoDelay() function into one

net/tools/flip_server/tcp_socket_util.h

 // Copyright (c) 2009 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_TOOLS_FLIP_SERVER_TCP_SOCKET_UTIL_H_
 #define NET_TOOLS_FLIP_SERVER_TCP_SOCKET_UTIL_H_
 
 #include <string>
 
 namespace net {
 
+// This function disables buffering in the kernel. By default, TCP sockets
+// will wait up to 200ms for more data to complete a packet before transmitting.
+// After calling this function, the kernel will not wait. See TCP_NODELAY in
+// `man 7 tcp`.
+// This function returns true if it succeeds to set the TCP_NODELAY option,
+// otherwise returns false.
+bool SetTCPNoDelay(int fd);
+
 // Summary:
 //   creates a socket for listening, and bind()s and listen()s it.
 // Args:
 //   host - hostname or numeric address, or empty-string if you want
 //          to bind to listen on all addresses
 //   port - a port number or service name. By service name I mean a
 //          -real- service name, not a Google service name. I'd suggest
 //          you just stick to a numeric representation like "80"
 //   is_numeric_host_address -
 //           if you know that the host address has already been looked-up,
@@ skipping 23 matching lines @@
 
 int CreateTCPClientSocket(const std::string& host,
                           const std::string& port,
                           bool is_numeric_host_address,
                           bool disable_nagle,
                           int* connect_fd);
 
 }  // namespace net
 
 #endif  // NET_TOOLS_FLIP_SERVER_TCP_SOCKET_UTIL_H_