C++11 declares a type safe null pointer

content/common/set_process_title.h

 // Copyright (c) 2010 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 CONTENT_COMMON_SET_PROCESS_TITLE_H_
 #define CONTENT_COMMON_SET_PROCESS_TITLE_H_
 
 namespace content {
 // Sets OS-specific process title information based on the command line. This
 // does nothing if the OS doesn't support or need this capability.
 //
 // Pass in the argv from main(). On Windows, where there is no argv, you can
-// pass NULL or just don't call this function, since it does nothing. This
+// pass nullptr or just don't call this function, since it does nothing. This
 // argv pointer will be cached so if you call this function again, you can pass
 // NULL in the second call. This is to support the case where it's called once
 // at startup, and later when a zygote is fork()ed. The later call doesn't have
 // easy access to main's argv.
 //
 // On non-Mac Unix platforms, we exec ourselves from /proc/self/exe, but that
 // makes the process name that shows up in "ps" etc. for the child processes
 // show as "exe" instead of "chrome" or something reasonable. This function
 // will try to fix it so the "effective" command line shows up instead.
 void SetProcessTitleFromCommandLine(const char** main_argv);
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SET_PROCESS_TITLE_H_