Replace NULL with nullptr in all C++ files.

webrtc/modules/video_coding/codecs/test/packet_manipulator.cc

 /*
  *  Copyright (c) 2012 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 28 matching lines @@
   int nbr_packets_dropped = 0;
   // There's no need to build a copy of the image data since viewing an
   // EncodedImage object, setting the length to a new lower value represents
   // that everything is dropped after that position in the byte array.
   // EncodedImage._size is the allocated bytes.
   // EncodedImage._length is how many that are filled with data.
   int new_length = 0;
   packet_reader_->InitializeReading(encoded_image->_buffer,
                                     encoded_image->_length,
                                     config_.packet_size_in_bytes);
-  uint8_t* packet = NULL;
+  uint8_t* packet = nullptr;
   int nbr_bytes_to_read;
   // keep track of if we've lost any packets, since then we shall loose
   // the remains of the current frame:
   bool packet_loss_has_occurred = false;
   while ((nbr_bytes_to_read = packet_reader_->NextPacket(&packet)) > 0) {
     // Check if we're currently in a packet loss burst that is not completed:
     if (active_burst_packets_ > 0) {
       active_burst_packets_--;
       nbr_packets_dropped++;
     } else if (RandomUniform() < config_.packet_loss_probability ||
@@ skipping 43 matching lines @@
     case kBurst:
       return "Burst";
     default:
       assert(false);
       return "Unknown";
   }
 }
 
 }  // namespace test
 }  // namespace webrtc