replace NULL->nullptr in src/remoting.

remoting/host/native_messaging/pipe_messaging_channel.cc

 // Copyright 2013 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/host/native_messaging/pipe_messaging_channel.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
@@ skipping 31 matching lines @@
 }  // namespace
 
 namespace remoting {
 
 PipeMessagingChannel::PipeMessagingChannel(
     base::File input,
     base::File output)
     : native_messaging_reader_(DuplicatePlatformFile(input.Pass())),
       native_messaging_writer_(new NativeMessagingWriter(
           DuplicatePlatformFile(output.Pass()))),
-      event_handler_(NULL),
+      event_handler_(nullptr),
       weak_factory_(this) {
   weak_ptr_ = weak_factory_.GetWeakPtr();
 }
 
 PipeMessagingChannel::~PipeMessagingChannel() {
 }
 
 void PipeMessagingChannel::Start(EventHandler* event_handler) {
   DCHECK(CalledOnValidThread());
   DCHECK(!event_handler_);
@@ skipping 25 matching lines @@
     // Close the write pipe so no more responses will be sent.
     native_messaging_writer_.reset();
     Shutdown();
   }
 }
 
 void PipeMessagingChannel::Shutdown() {
   DCHECK(CalledOnValidThread());
 
   if (event_handler_) {
-    // Set event_handler_ to NULL to indicate the object is in a shutdown cycle.
-    // Since event_handler->OnDisconnect() will destroy the current object,
-    // |event_handler_| will become a dangling pointer after OnDisconnect()
-    // returns. Therefore, we set |event_handler_| to NULL beforehand.
+    // Set |event_handler_| to nullptr to indicate the object is in a shutdown
+    // cycle. Since event_handler->OnDisconnect() will destroy the current
+    // object, |event_handler_| will become a dangling pointer after
+    // OnDisconnect() returns. Therefore, we set |event_handler_| to nullptr
+    // beforehand.
     EventHandler* handler = event_handler_;
-    event_handler_ = NULL;
+    event_handler_ = nullptr;
     handler->OnDisconnect();
   }
 }
 
 }  // namespace remoting