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

net/http/http_proxy_client_socket_wrapper.cc

 // Copyright 2015 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/http/http_proxy_client_socket_wrapper.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 285 matching lines @@
     return transport_socket_->SetReceiveBufferSize(size);
   return ERR_SOCKET_NOT_CONNECTED;
 }
 
 int HttpProxyClientSocketWrapper::SetSendBufferSize(int32_t size) {
   if (transport_socket_)
     return transport_socket_->SetSendBufferSize(size);
   return ERR_SOCKET_NOT_CONNECTED;
 }
 
+int HttpProxyClientSocketWrapper::SetDoNotFragment(bool do_not_fragment) {
+  if (transport_socket_)
+    return transport_socket_->SetDoNotFragment(do_not_fragment);
+  return ERR_SOCKET_NOT_CONNECTED;
+}
+
 int HttpProxyClientSocketWrapper::GetPeerAddress(IPEndPoint* address) const {
   if (transport_socket_)
     return transport_socket_->GetPeerAddress(address);
   return ERR_SOCKET_NOT_CONNECTED;
 }
 
 int HttpProxyClientSocketWrapper::GetLocalAddress(IPEndPoint* address) const {
   if (transport_socket_)
     return transport_socket_->GetLocalAddress(address);
   return ERR_SOCKET_NOT_CONNECTED;
@@ skipping 304 matching lines @@
 const HostResolver::RequestInfo&
 HttpProxyClientSocketWrapper::GetDestination() {
   if (transport_params_) {
     return transport_params_->destination();
   } else {
     return ssl_params_->GetDirectConnectionParams()->destination();
   }
 }
 
 }  // namespace net