replace NULL->nullptr in src/remoting.

remoting/client/plugin/pepper_packet_socket_factory.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/client/plugin/pepper_packet_socket_factory.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
@@ skipping 395 matching lines @@
 
 PepperPacketSocketFactory::~PepperPacketSocketFactory() {
 }
 
 rtc::AsyncPacketSocket* PepperPacketSocketFactory::CreateUdpSocket(
       const rtc::SocketAddress& local_address,
       uint16 min_port,
       uint16 max_port) {
   scoped_ptr<UdpPacketSocket> result(new UdpPacketSocket(pp_instance_));
   if (!result->Init(local_address, min_port, max_port))
-    return NULL;
+    return nullptr;
   return result.release();
 }
 
 rtc::AsyncPacketSocket* PepperPacketSocketFactory::CreateServerTcpSocket(
     const rtc::SocketAddress& local_address,
     uint16 min_port,
     uint16 max_port,
     int opts) {
   // We don't use TCP sockets for remoting connections.
   NOTREACHED();
-  return NULL;
+  return nullptr;
 }
 
 rtc::AsyncPacketSocket* PepperPacketSocketFactory::CreateClientTcpSocket(
       const rtc::SocketAddress& local_address,
       const rtc::SocketAddress& remote_address,
       const rtc::ProxyInfo& proxy_info,
       const std::string& user_agent,
       int opts) {
   // We don't use TCP sockets for remoting connections.
   NOTREACHED();
-  return NULL;
+  return nullptr;
 }
 
 rtc::AsyncResolverInterface*
 PepperPacketSocketFactory::CreateAsyncResolver() {
   return new PepperAddressResolver(pp_instance_);
 }
 
 }  // namespace remoting