gfe-relnote: Use HandshakerDelegateInterface in QUIC handshakers. Abstract keys installation, keys discarding, default encryption level change and mark handshake complete to HandshakerDelegateInterface. Protected by gfe2_reloadable_flag_quic_use_handshaker_delegate.

The final goal is remove session pointer from handshakers.

PiperOrigin-RevId: 282826263
Change-Id: I9b379ccfcebd174df1850f7df45069d388460173
diff --git a/quic/quartc/quartc_session.h b/quic/quartc/quartc_session.h
index e9001d6..1c0fd31 100644
--- a/quic/quartc/quartc_session.h
+++ b/quic/quartc/quartc_session.h
@@ -74,6 +74,7 @@
   }
 
   void OnCryptoHandshakeEvent(CryptoHandshakeEvent event) override;
+  void SetDefaultEncryptionLevel(EncryptionLevel level) override;
 
   // QuicConnectionVisitorInterface overrides.
   void OnCongestionWindowChange(QuicTime now) override;