Replace NULL with nullptr in all C++ files.

webrtc/modules/video_coding/test/stream_generator.cc

 /*
  *  Copyright (c) 2013 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 79 matching lines @@
   if (it == packets_.end())
     return false;
   if (packet)
     *packet = (*it);
   return true;
 }
 
 bool StreamGenerator::NextPacket(VCMPacket* packet) {
   if (packets_.empty())
     return false;
-  if (packet != NULL)
+  if (packet != nullptr)
     *packet = packets_.front();
   packets_.pop_front();
   return true;
 }
 
 void StreamGenerator::DropLastPacket() {
   packets_.pop_back();
 }
 
 uint16_t StreamGenerator::NextSequenceNumber() const {
@@ skipping 10 matching lines @@
   std::list<VCMPacket>::iterator it = packets_.begin();
   for (int i = 0; i < index; ++i) {
     ++it;
     if (it == packets_.end())
       break;
   }
   return it;
 }
 
 }  // namespace webrtc