replace NULL->nullptr in src/remoting.

remoting/protocol/fake_session.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/fake_session.h"
 
 namespace remoting {
 namespace protocol {
 
 const char kTestJid[] = "host1@gmail.com/chromoting123";
 
 FakeSession::FakeSession()
-    : event_handler_(NULL),
+    : event_handler_(nullptr),
       candidate_config_(CandidateSessionConfig::CreateDefault()),
       config_(SessionConfig::ForTest()),
       jid_(kTestJid),
       error_(OK),
       closed_(false) {
 }
 FakeSession::~FakeSession() { }
 
 void FakeSession::SetEventHandler(EventHandler* event_handler) {
   event_handler_ = event_handler;
@@ skipping 26 matching lines @@
 StreamChannelFactory* FakeSession::GetMultiplexedChannelFactory() {
   return &channel_factory_;
 }
 
 void FakeSession::Close() {
   closed_ = true;
 }
 
 }  // namespace protocol
 }  // namespace remoting