replace NULL->nullptr in src/remoting.

remoting/protocol/host_control_dispatcher.cc

 // 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.
 
 #include "remoting/protocol/host_control_dispatcher.h"
 
 #include "base/callback_helpers.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "net/socket/stream_socket.h"
 #include "remoting/base/constants.h"
 #include "remoting/proto/control.pb.h"
 #include "remoting/proto/internal.pb.h"
 #include "remoting/protocol/clipboard_stub.h"
 #include "remoting/protocol/host_stub.h"
 #include "remoting/protocol/message_serialization.h"
 
 namespace remoting {
 namespace protocol {
 
 HostControlDispatcher::HostControlDispatcher()
     : ChannelDispatcherBase(kControlChannelName),
-      clipboard_stub_(NULL),
-      host_stub_(NULL) {
+      clipboard_stub_(nullptr),
+      host_stub_(nullptr) {
 }
 
 HostControlDispatcher::~HostControlDispatcher() {
   writer_.Close();
 }
 
 void HostControlDispatcher::OnInitialized() {
   reader_.Init(channel(), base::Bind(
       &HostControlDispatcher::OnMessageReceived, base::Unretained(this)));
   writer_.Init(channel(), BufferedSocketWriter::WriteFailedCallback());
@@ skipping 54 matching lines @@
     host_stub_->RequestPairing(message->pairing_request());
   } else if (message->has_extension_message()) {
     host_stub_->DeliverClientMessage(message->extension_message());
   } else {
     LOG(WARNING) << "Unknown control message received.";
   }
 }
 
 }  // namespace protocol
 }  // namespace remoting