Remove redundant calls to QuicSession::NeuterUnencryptedData(). Upon finishing handshakes, the TLS handshaker always calls QuicSession::OnCryptoHandshakeEvent(HANDSHAKE_CONFIRMED), which does the job of neutering unencrypted data. gfe-relnote: protected by disabled v99 flag. PiperOrigin-RevId: 275516067 Change-Id: Ic949e6694a8d32fd24960eeac9e0bb2cd8555bf9