gfe-relnote: In QUIC sent packet manager, replace handshake_confirmed_ and forward_secure_packet_acked_ with handshake_state_. No functional change expected. Not protected.

Also rename QuicConnection::IsHandshakeConfirmed to QuicConnection::IsHandshakeComplete.

PiperOrigin-RevId: 281069350
Change-Id: Id40366a9148add245798b1805ae5f1e3a46d5fc6
diff --git a/quic/core/quic_session.h b/quic/core/quic_session.h
index c4f2d98..03090d8 100644
--- a/quic/core/quic_session.h
+++ b/quic/core/quic_session.h
@@ -73,6 +73,7 @@
   };
 
   // CryptoHandshakeEvent enumerates the events generated by a QuicCryptoStream.
+  // TODO(fayang): Replace this enum and with HandshakeState.
   enum CryptoHandshakeEvent {
     // ENCRYPTION_ESTABLISHED indicates that a client hello has been sent and
     // subsequent packets will be encrypted. (Client only.)