replace NULL->nullptr in src/remoting.

remoting/protocol/channel_multiplexer.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_CHANNEL_MULTIPLEXER_H_
 #define REMOTING_PROTOCOL_CHANNEL_MULTIPLEXER_H_
 
 #include "base/memory/weak_ptr.h"
 #include "remoting/proto/mux.pb.h"
 #include "remoting/protocol/buffered_socket_writer.h"
@@ skipping 39 matching lines @@
   void NotifyWriteFailed(const std::string& name);
 
   // Callback for |reader_;
   void OnIncomingPacket(scoped_ptr<MultiplexPacket> packet,
                         const base::Closure& done_task);
 
   // Called by MuxChannel.
   bool DoWrite(scoped_ptr<MultiplexPacket> packet,
                const base::Closure& done_task);
 
-  // Factory used to create |base_channel_|. Set to NULL once creation is
+  // Factory used to create |base_channel_|. Set to nullptr once creation is
   // finished or failed.
   StreamChannelFactory* base_channel_factory_;
 
   // Name of the underlying channel.
   std::string base_channel_name_;
 
   // The channel over which to multiplex.
   scoped_ptr<net::StreamSocket> base_channel_;
 
   // List of requested channels while we are waiting for |base_channel_|.
@@ skipping 12 matching lines @@
   base::WeakPtrFactory<ChannelMultiplexer> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelMultiplexer);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 
 #endif  // REMOTING_PROTOCOL_CHANNEL_MULTIPLEXER_H_