replace NULL->nullptr in src/remoting.

remoting/client/plugin/delegating_signal_strategy.cc

 // 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.
 
 #include "remoting/client/plugin/delegating_signal_strategy.h"
 
 #include "base/rand_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
 
@@ skipping 11 matching lines @@
 
 void DelegatingSignalStrategy::OnIncomingMessage(const std::string& message) {
  scoped_ptr<buzz::XmlElement> stanza(buzz::XmlElement::ForStr(message));
   if (!stanza.get()) {
     LOG(WARNING) << "Malformed XMPP stanza received: " << message;
     return;
   }
 
   ObserverListBase<Listener>::Iterator it(listeners_);
   Listener* listener;
-  while ((listener = it.GetNext()) != NULL) {
+  while ((listener = it.GetNext()) != nullptr) {
     if (listener->OnSignalStrategyIncomingStanza(stanza.get()))
       break;
   }
 }
 
 void DelegatingSignalStrategy::Connect() {
 }
 
 void DelegatingSignalStrategy::Disconnect() {
 }
@@ skipping 21 matching lines @@
 bool DelegatingSignalStrategy::SendStanza(scoped_ptr<buzz::XmlElement> stanza) {
   send_iq_callback_.Run(stanza->Str());
   return true;
 }
 
 std::string DelegatingSignalStrategy::GetNextId() {
   return base::Uint64ToString(base::RandUint64());
 }
 
 }  // namespace remoting