gfe-relnote: Let QUIC client drops initial key when a handshake packet has been sent. protected by existing gfe2_reloadable_flag_quic_enable_version_draft_25_v3 and gfe2_reloadable_flag_quic_enable_version_draft_27.

PiperOrigin-RevId: 308882771
Change-Id: Icbae03467ebc7845dacb8d6398cd2657dcf11632
diff --git a/quic/core/quic_crypto_server_stream.h b/quic/core/quic_crypto_server_stream.h
index fd14d27..8eef07c 100644
--- a/quic/core/quic_crypto_server_stream.h
+++ b/quic/core/quic_crypto_server_stream.h
@@ -42,6 +42,7 @@
       CachedNetworkParameters cached_network_params) override;
   void OnPacketDecrypted(EncryptionLevel level) override;
   void OnOneRttPacketAcknowledged() override {}
+  void OnHandshakePacketSent() override {}
   void OnHandshakeDoneReceived() override;
   bool ShouldSendExpectCTHeader() const override;