Add a SetDoNotFragment() method to DatagramSocket, and call this for

net/socket/unix_domain_client_socket_posix.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/unix_domain_client_socket_posix.h"
 
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <utility>
 
@@ skipping 158 matching lines @@
 int UnixDomainClientSocket::SetReceiveBufferSize(int32_t size) {
   NOTIMPLEMENTED();
   return ERR_NOT_IMPLEMENTED;
 }
 
 int UnixDomainClientSocket::SetSendBufferSize(int32_t size) {
   NOTIMPLEMENTED();
   return ERR_NOT_IMPLEMENTED;
 }
 
+int UnixDomainClientSocket::SetDoNotFragment(bool do_not_fragment) {
+  NOTIMPLEMENTED();
+  return ERR_NOT_IMPLEMENTED;
+}
+
 SocketDescriptor UnixDomainClientSocket::ReleaseConnectedSocket() {
   DCHECK(socket_);
   DCHECK(socket_->IsConnected());
 
   SocketDescriptor socket_fd = socket_->ReleaseConnectedSocket();
   socket_.reset();
   return socket_fd;
 }
 
 }  // namespace net