C++11 declares a type safe null pointer

content/common/plugin_list.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 CONTENT_COMMON_PLUGIN_LIST_H_
 #define CONTENT_COMMON_PLUGIN_LIST_H_
 
 #include <set>
 #include <string>
 #include <utility>
@@ skipping 93 matching lines @@
                   bool include_npapi);
 
   // Copies the list of plug-ins into |plugins| without loading them.
   // Returns true if the list of plugins is up-to-date.
   bool GetPluginsNoRefresh(std::vector<WebPluginInfo>* plugins);
 
   // Returns a list in |info| containing plugins that are found for
   // the given url and mime type (including disabled plugins, for
   // which |info->enabled| is false).  The mime type which corresponds
   // to the URL is optionally returned back in |actual_mime_types| (if
-  // it is non-NULL), one for each of the plugin info objects found.
+  // it is non-nullptr), one for each of the plugin info objects found.
   // The |allow_wildcard| parameter controls whether this function
   // returns plugins which support wildcard mime types (* as the mime
-  // type).  The |info| parameter is required to be non-NULL.  The
+  // type).  The |info| parameter is required to be non-nullptr.  The
   // list is in order of "most desirable" to "least desirable".
-  // If |use_stale| is NULL, this will load the plug-in list if necessary.
-  // If it is not NULL, the plug-in list will not be loaded, and |*use_stale|
+  // If |use_stale| is nullptr, this will load the plug-in list if necessary.
+  // If it is not nullptr, the plug-in list will not be loaded, and |*use_stale|
   // will be true iff the plug-in list was stale.
   void GetPluginInfoArray(const GURL& url,
                           const std::string& mime_type,
                           bool allow_wildcard,
                           bool* use_stale,
                           bool include_npapi,
                           std::vector<WebPluginInfo>* info,
                           std::vector<std::string>* actual_mime_types);
 
   // Load a specific plugin with full path. Return true iff loading the plug-in
@@ skipping 108 matching lines @@
   // Flag indicating whether third_party plugins will be searched for
   // in common places.
   bool plugins_discovery_disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginList);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_PLUGIN_LIST_H_