ipc: remove unused variable from CreateClientUnixDomainSocket() function

ipc/unix_domain_socket_util.h

 // Copyright 2013 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 IPC_UNIX_DOMAIN_SOCKET_UTIL_H_
 #define IPC_UNIX_DOMAIN_SOCKET_UTIL_H_
 
 #include <stddef.h>
 #include <sys/types.h>
 
-#include <string>
-
 #include "ipc/ipc_export.h"
 
 namespace base {
 class FilePath;
 }  // namespace base
 
 namespace IPC {
 
 // Creates a UNIX-domain socket at |socket_name| and bind()s it, then listen()s
 // on it. If successful, |server_listen_fd| will be set to the new file
@@ skipping 33 matching lines @@
 
 // The maximum length of the name of a socket for MODE_NAMED_SERVER or
 // MODE_NAMED_CLIENT if you want to pass in your own socket.
 // The standard size on linux is 108, mac is 104. To maintain consistency
 // across platforms we standardize on the smaller value.
 static const size_t kMaxSocketNameLength = 104;
 
 }  // namespace IPC
 
 #endif  // IPC_UNIX_DOMAIN_SOCKET_UTIL_H_