replace NULL->nullptr in src/remoting.

remoting/protocol/content_description.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 "remoting/protocol/content_description.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "remoting/base/constants.h"
 #include "remoting/protocol/authenticator.h"
@@ skipping 105 matching lines @@
     scoped_ptr<CandidateSessionConfig> config,
     scoped_ptr<buzz::XmlElement> authenticator_message)
     : candidate_config_(config.Pass()),
       authenticator_message_(authenticator_message.Pass()) {
 }
 
 ContentDescription::~ContentDescription() { }
 
 ContentDescription* ContentDescription::Copy() const {
   if (!candidate_config_.get() || !authenticator_message_.get()) {
-    return NULL;
+    return nullptr;
   }
   scoped_ptr<XmlElement> message(new XmlElement(*authenticator_message_));
   return new ContentDescription(candidate_config_->Clone(), message.Pass());
 }
 
 // ToXml() creates content description for chromoting session. The
 // description looks as follows:
 //   <description xmlns="google:remoting">
 //     <control transport="stream" version="1" />
 //     <event transport="datagram" version="1" />
@@ skipping 96 matching lines @@
   const XmlElement* child = Authenticator::FindAuthenticatorMessage(element);
   if (child)
     authenticator_message.reset(new XmlElement(*child));
 
   return make_scoped_ptr(
       new ContentDescription(config.Pass(), authenticator_message.Pass()));
 }
 
 }  // namespace protocol
 }  // namespace remoting