replace NULL->nullptr in src/remoting.

remoting/host/win/chromoting_module.cc

 // Copyright (c) 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/win/chromoting_module.h"
 
 #include <sddl.h>
 
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 150 matching lines @@
 
 LONG ChromotingModule::Unlock() {
   LONG count = ATL::CAtlModuleT<ChromotingModule>::Unlock();
 
   if (!count) {
     // Stop accepting activations.
     HRESULT hr = CoSuspendClassObjects();
     CHECK(SUCCEEDED(hr));
 
     // Release the message loop reference, causing the message loop to exit.
-    g_module_task_runner.Get() = NULL;
+    g_module_task_runner.Get() = nullptr;
   }
 
   return count;
 }
 
 HRESULT ChromotingModule::RegisterClassObjects(DWORD class_context,
                                                DWORD flags) {
   for (ATL::_ATL_OBJMAP_ENTRY* i = classes_; i != classes_end_; ++i) {
     HRESULT result = i->RegisterClassObject(class_context, flags);
     if (FAILED(result))
@@ skipping 42 matching lines @@
 
   ATL::_ATL_OBJMAP_ENTRY rdp_client_entry[] = {
     OBJECT_ENTRY(__uuidof(RdpDesktopSession), RdpDesktopSession)
   };
 
   ChromotingModule module(rdp_client_entry, rdp_client_entry + 1);
   return module.Run() ? kSuccessExitCode : kInitializationFailed;
 }
 
 } // namespace remoting