Replace NULL with nullptr or null in webrtc/base/.

webrtc/base/virtualsocketserver.h

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 195 matching lines @@
   // Basic operations on functions.  Those that return a function also take
   // ownership of the function given (and hence, may modify or delete it).
   static Function* Accumulate(Function* f);
   static Function* Invert(Function* f);
   static Function* Resample(Function* f,
                             double x1,
                             double x2,
                             uint32_t samples);
   static double Evaluate(Function* f, double x);
 
-  // NULL out our message queue if it goes away. Necessary in the case where
+  // Null out our message queue if it goes away. Necessary in the case where
   // our lifetime is greater than that of the thread we are using, since we
   // try to send Close messages for all connected sockets when we shutdown.
-  void OnMessageQueueDestroyed() { msg_queue_ = NULL; }
+  void OnMessageQueueDestroyed() { msg_queue_ = nullptr; }
 
   // Determine if two sockets should be able to communicate.
   // We don't (currently) specify an address family for sockets; instead,
   // the currently bound address is used to infer the address family.
   // Any socket that is not explicitly bound to an IPv4 address is assumed to be
   // dual-stack capable.
   // This function tests if two addresses can communicate, as well as the
   // sockets to which they may be bound (the addresses may or may not yet be
   // bound to the sockets).
   // First the addresses are tested (after normalization):
@@ skipping 156 matching lines @@
 
   // Store the options that are set
   OptionsMap options_map_;
 
   friend class VirtualSocketServer;
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_BASE_VIRTUALSOCKETSERVER_H_