replace NULL->nullptr in src/remoting.

remoting/host/desktop_session_win.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/desktop_session_win.h"
 
 #include <limits>
 #include <sddl.h>
 
 #include "base/base_switches.h"
@@ skipping 316 matching lines @@
 STDMETHODIMP RdpSession::EventHandler::QueryInterface(REFIID riid, void** ppv) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (riid == IID_IUnknown ||
       riid == IID_IRdpDesktopSessionEventHandler) {
     *ppv = static_cast<IRdpDesktopSessionEventHandler*>(this);
     AddRef();
     return S_OK;
   }
 
-  *ppv = NULL;
+  *ppv = nullptr;
   return E_NOINTERFACE;
 }
 
 STDMETHODIMP RdpSession::EventHandler::OnRdpConnected() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   if (desktop_session_)
     desktop_session_->OnRdpConnected();
 
   return S_OK;
@@ skipping 250 matching lines @@
                                 exploded.hour,
                                 exploded.minute,
                                 exploded.second,
                                 exploded.millisecond,
                                 passed.c_str());
 
   last_timestamp_ = now;
 }
 
 }  // namespace remoting