Move QuicCryptoServerStream::Helper to QuicCryptoServerStreamBase

gfe-relnote: rename class - no behavior change
PiperOrigin-RevId: 296246242
Change-Id: I68425fe4ba7a2040eed4bf93835639e6f353a406
diff --git a/quic/core/quic_crypto_server_handshaker.cc b/quic/core/quic_crypto_server_handshaker.cc
index 6150642..a4994a0 100644
--- a/quic/core/quic_crypto_server_handshaker.cc
+++ b/quic/core/quic_crypto_server_handshaker.cc
@@ -51,7 +51,7 @@
     QuicCryptoServerStream* stream,
     QuicCompressedCertsCache* compressed_certs_cache,
     QuicSession* session,
-    QuicCryptoServerStream::Helper* helper)
+    QuicCryptoServerStreamBase::Helper* helper)
     : QuicCryptoHandshaker(stream, session),
       stream_(stream),
       session_(session),