replace NULL->nullptr in src/remoting.

remoting/signaling/server_log_entry.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/server_log_entry.h"
 
 #include "base/logging.h"
 #include "base/sys_info.h"
 #include "remoting/base/constants.h"
 #include "third_party/webrtc/libjingle/xmllite/xmlelement.h"
@@ skipping 29 matching lines @@
 
 void ServerLogEntry::Set(const std::string& key, const std::string& value) {
   values_map_[key] = value;
 }
 
 void ServerLogEntry::AddCpuField() {
   Set(kKeyCpu, SysInfo::OperatingSystemArchitecture());
 }
 
 void ServerLogEntry::AddModeField(ServerLogEntry::Mode mode) {
-  const char* mode_value = NULL;
+  const char* mode_value = nullptr;
   switch (mode) {
     case IT2ME:
       mode_value = kValueModeIt2Me;
       break;
     case ME2ME:
       mode_value = kValueModeMe2Me;
       break;
     default:
       NOTREACHED();
   }
@@ skipping 18 matching lines @@
   scoped_ptr<XmlElement> stanza(new XmlElement(QName(
       kChromotingXmlNamespace, kLogEntry)));
   ValuesMap::const_iterator iter;
   for (iter = values_map_.begin(); iter != values_map_.end(); ++iter) {
     stanza->AddAttr(QName(std::string(), iter->first), iter->second);
   }
   return stanza.Pass();
 }
 
 }  // namespace remoting