replace NULL->nullptr in src/remoting.

remoting/protocol/authenticator.h

 // 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.
 
 #ifndef REMOTING_PROTOCOL_AUTHENTICATOR_H_
 #define REMOTING_PROTOCOL_AUTHENTICATOR_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 61 matching lines @@
     PROTOCOL_ERROR,
   };
 
   // Returns true if |message| is an Authenticator message.
   static bool IsAuthenticatorMessage(const buzz::XmlElement* message);
 
   // Creates an empty Authenticator message, owned by the caller.
   static scoped_ptr<buzz::XmlElement> CreateEmptyAuthenticatorMessage();
 
   // Finds Authenticator message among child elements of |message|, or
-  // returns NULL otherwise.
+  // returns nullptr otherwise.
   static const buzz::XmlElement* FindAuthenticatorMessage(
       const buzz::XmlElement* message);
 
   Authenticator() {}
   virtual ~Authenticator() {}
 
   // Returns current state of the authenticator.
   virtual State state() const = 0;
 
   // Returns whether authentication has started. The chromoting host uses this
@@ skipping 25 matching lines @@
 // Factory for Authenticator instances.
 class AuthenticatorFactory {
  public:
   AuthenticatorFactory() {}
   virtual ~AuthenticatorFactory() {}
 
   // Called when session-initiate stanza is received to create
   // authenticator for the new session. |first_message| specifies
   // authentication part of the session-initiate stanza so that
   // appropriate type of Authenticator can be chosen for the session
-  // (useful when multiple authenticators is supported). Returns NULL
+  // (useful when multiple authenticators is supported). Returns nullptr
   // if the |first_message| is invalid and the session should be
   // rejected. ProcessMessage() should be called with |first_message|
   // for the result of this method.
   virtual scoped_ptr<Authenticator> CreateAuthenticator(
       const std::string& local_jid,
       const std::string& remote_jid,
       const buzz::XmlElement* first_message) = 0;
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_AUTHENTICATOR_H_