replace NULL->nullptr in src/remoting.

remoting/signaling/log_to_server.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 "remoting/signaling/log_to_server.h"
 
 #include "remoting/base/constants.h"
 #include "remoting/signaling/iq_sender.h"
 #include "remoting/signaling/signal_strategy.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
@@ skipping 32 matching lines @@
     const buzz::XmlElement* stanza) {
   return false;
 }
 
 void LogToServer::Log(const ServerLogEntry& entry) {
   pending_entries_.push_back(entry);
   SendPendingEntries();
 }
 
 void LogToServer::SendPendingEntries() {
-  if (iq_sender_ == NULL) {
+  if (iq_sender_ == nullptr) {
     return;
   }
   if (pending_entries_.empty()) {
     return;
   }
   // Make one stanza containing all the pending entries.
   scoped_ptr<XmlElement> stanza(ServerLogEntry::MakeStanza());
   while (!pending_entries_.empty()) {
     ServerLogEntry& entry = pending_entries_.front();
     stanza->AddElement(entry.ToStanza().release());
     pending_entries_.pop_front();
   }
   // Send the stanza to the server.
   scoped_ptr<IqRequest> req = iq_sender_->SendIq(
       buzz::STR_SET, directory_bot_jid_, stanza.Pass(),
       IqSender::ReplyCallback());
   // We ignore any response, so let the IqRequest be destroyed.
   return;
 }
 
 }  // namespace remoting