// Returns a newly created QuicData object containing the encrypted
// |plaintext| as well as a MAC over both |plaintext| and |associated_data|,
- // or NULL if there is an error. |sequence_number| is appended to the
+ // or nullptr if there is an error. |sequence_number| is appended to the
// |nonce_prefix| value provided in SetNoncePrefix() to form the nonce.
virtual QuicData* EncryptPacket(QuicPacketSequenceNumber sequence_number,
base::StringPiece associated_data,