QUIC - (no behavior change) s/NULL/nullptr/g in .../quic/...

net/quic/quic_unacked_packet_map.h

Index: net/quic/quic_unacked_packet_map.h
diff --git a/net/quic/quic_unacked_packet_map.h b/net/quic/quic_unacked_packet_map.h
index a7c62ccec78b44533e8ec09dabc2fabe5a717118..9806ffc12d159b67537286d0e1a30293079596f6 100644
--- a/net/quic/quic_unacked_packet_map.h
+++ b/net/quic/quic_unacked_packet_map.h
@@ -153,11 +153,11 @@ class NET_EXPORT_PRIVATE QuicUnackedPacketMap {
   // Newly serialized retransmittable and fec packets are added to this map,
   // which contains owning pointers to any contained frames.  If a packet is
   // retransmitted, this map will contain entries for both the old and the new
-  // packet. The old packet's retransmittable frames entry will be NULL, while
-  // the new packet's entry will contain the frames to retransmit.
+  // packet. The old packet's retransmittable frames entry will be nullptr,
+  // while the new packet's entry will contain the frames to retransmit.
   // If the old packet is acked before the new packet, then the old entry will
   // be removed from the map and the new entry's retransmittable frames will be
-  // set to NULL.
+  // set to nullptr.
   UnackedPacketMap unacked_packets_;
   // The packet at the 0th index of unacked_packets_.
   QuicPacketSequenceNumber least_unacked_;