replace NULL->nullptr in src/remoting.

remoting/host/config_file_watcher.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/host/config_file_watcher.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 78 matching lines @@
 ConfigFileWatcher::ConfigFileWatcher(
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
     const base::FilePath& config_path)
     : impl_(new ConfigFileWatcherImpl(main_task_runner,
                                       io_task_runner, config_path)) {
 }
 
 ConfigFileWatcher::~ConfigFileWatcher() {
   impl_->StopWatching();
-  impl_ = NULL;
+  impl_ = nullptr;
 }
 
 void ConfigFileWatcher::Watch(ConfigWatcher::Delegate* delegate) {
   impl_->Watch(delegate);
 }
 
 ConfigFileWatcherImpl::ConfigFileWatcherImpl(
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
     const base::FilePath& config_path)
     : config_path_(config_path),
       retries_(0),
-      delegate_(NULL),
+      delegate_(nullptr),
       main_task_runner_(main_task_runner),
       io_task_runner_(io_task_runner),
       weak_factory_(this) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
 }
 
 void ConfigFileWatcherImpl::Watch(ConfigWatcher::Delegate* delegate) {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   DCHECK(!delegate_);
 
@@ skipping 108 matching lines @@
   if (config_ != config) {
     config_ = config;
     main_task_runner_->PostTask(
         FROM_HERE,
         base::Bind(&ConfigFileWatcherImpl::NotifyUpdate,
             weak_factory_.GetWeakPtr(), config_));
   }
 }
 
 }  // namespace remoting