replace NULL->nullptr in src/remoting.

remoting/protocol/channel_dispatcher_base.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_DISPATCHER_BASE_H_
 #define REMOTING_PROTOCOL_CHANNEL_DISPATCHER_BASE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 23 matching lines @@
 
   virtual ~ChannelDispatcherBase();
 
   // Creates and connects the channel in the specified
   // |session|. Caller retains ownership of the Session.
   void Init(Session* session,
             const ChannelConfig& config,
             const InitializedCallback& callback);
 
   // Returns true if the channel is currently connected.
-  bool is_connected() { return channel() != NULL; }
+  bool is_connected() { return channel() != nullptr; }
 
  protected:
   explicit ChannelDispatcherBase(const char* channel_name);
 
   net::StreamSocket* channel() { return channel_.get(); }
 
   // Called when channel is initialized. Must be overriden in the
   // child classes. Should not delete the dispatcher.
   virtual void OnInitialized() = 0;
 
  private:
   void OnChannelReady(scoped_ptr<net::StreamSocket> socket);
 
   std::string channel_name_;
   StreamChannelFactory* channel_factory_;
   InitializedCallback initialized_callback_;
   scoped_ptr<net::StreamSocket> channel_;
 
   DISALLOW_COPY_AND_ASSIGN(ChannelDispatcherBase);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_CHANNEL_DISPATCHER_BASE_H_