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

jingle/glue/proxy_resolving_client_socket.cc

 // Copyright (c) 2012 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 "jingle/glue/proxy_resolving_client_socket.h"
 
 #include <stdint.h>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 115 matching lines @@
   return net::ERR_SOCKET_NOT_CONNECTED;
 }
 
 int ProxyResolvingClientSocket::SetSendBufferSize(int32_t size) {
   if (transport_.get() && transport_->socket())
     return transport_->socket()->SetSendBufferSize(size);
   NOTREACHED();
   return net::ERR_SOCKET_NOT_CONNECTED;
 }
 
+int ProxyResolvingClientSocket::SetDoNotFragment(bool do_not_fragment) {
+  if (transport_.get() && transport_->socket())
+    return transport_->socket()->SetSendBufferSize(do_not_fragment);
+  NOTREACHED();
+  return net::ERR_SOCKET_NOT_CONNECTED;
+}
+
 int ProxyResolvingClientSocket::Connect(
     const net::CompletionCallback& callback) {
   DCHECK(user_connect_callback_.is_null());
 
   tried_direct_connect_fallback_ = false;
 
   // First we try and resolve the proxy.
   int status = network_session_->proxy_service()->ResolveProxy(
       proxy_url_,
       std::string(),
@@ skipping 277 matching lines @@
   return 0;
 }
 
 void ProxyResolvingClientSocket::CloseTransportSocket() {
   if (transport_.get() && transport_->socket())
     transport_->socket()->Disconnect();
   transport_.reset();
 }
 
 }  // namespace jingle_glue