replace NULL->nullptr in src/remoting.

remoting/host/chromoting_host_context.h

 // 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.
 
 #ifndef REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 #define REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace net {
 class URLRequestContextGetter;
 }  // namespace net
 
 namespace remoting {
 
 class AutoThreadTaskRunner;
 
 // A class that manages threads and running context for the chromoting host
 // process.  This class is virtual only for testing purposes (see below).
 class ChromotingHostContext {
  public:
   // Create threads and URLRequestContextGetter for use by a host.
   // During shutdown the caller should tear-down the ChromotingHostContext and
   // then continue to run until |ui_task_runner| is no longer referenced.
-  // NULL is returned if any threads fail to start.
+  // nullptr is returned if any threads fail to start.
   static scoped_ptr<ChromotingHostContext> Create(
       scoped_refptr<AutoThreadTaskRunner> ui_task_runner);
 
 #if defined(OS_CHROMEOS)
   // Attaches task runners to the relevant browser threads for the chromoting
   // host.  Must be called on the UI thread of the browser process.
   // remoting::UrlRequestContextGetter returns BasicURLRequestContext under
   // the hood which spawns two new threads per instance.  Since
   // ChromotingHostContext can be destroyed from any thread, as its owner
   // (It2MeHost) is ref-counted, joining the created threads during shutdown
@@ skipping 73 matching lines @@
 
   // Serves URLRequestContexts that use the network and UI task runners.
   scoped_refptr<net::URLRequestContextGetter> url_request_context_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromotingHostContext);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_CHROMOTING_HOST_CONTEXT_H_