replace NULL->nullptr in src/remoting.

remoting/protocol/connection_to_client.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_CONNECTION_TO_CLIENT_H_
 #define REMOTING_PROTOCOL_CONNECTION_TO_CLIENT_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 68 matching lines @@
   // Disconnect the client connection.
   virtual void Disconnect();
 
   // Callback for HostEventDispatcher to be called with a timestamp for each
   // received event.
   virtual void OnEventTimestamp(int64 timestamp);
 
   // Get the stubs used by the host to transmit messages to the client.
   // The stubs must not be accessed before OnConnectionAuthenticated(), or
   // after OnConnectionClosed().
-  // Note that the audio stub will be NULL if audio is not enabled.
+  // Note that the audio stub will be nullptr if audio is not enabled.
   virtual VideoStub* video_stub();
   virtual AudioStub* audio_stub();
   virtual ClientStub* client_stub();
 
   // Set/get the stubs which will handle messages we receive from the client.
   // All stubs MUST be set before the session's channels become connected.
   virtual void set_clipboard_stub(ClipboardStub* clipboard_stub);
   virtual ClipboardStub* clipboard_stub();
   virtual void set_host_stub(HostStub* host_stub);
   virtual HostStub* host_stub();
@@ skipping 32 matching lines @@
   scoped_ptr<HostVideoDispatcher> video_dispatcher_;
   scoped_ptr<AudioWriter> audio_writer_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionToClient);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CONNECTION_TO_CLIENT_H_