Move QuicCryptoServerStream::Helper to QuicCryptoServerStreamBase

gfe-relnote: rename class - no behavior change
PiperOrigin-RevId: 296246242
Change-Id: I68425fe4ba7a2040eed4bf93835639e6f353a406

quic/core/quic_crypto_server_handshaker.h

diff --git a/quic/core/quic_crypto_server_handshaker.h b/quic/core/quic_crypto_server_handshaker.h
index e6d5cae..257ee16 100644
--- a/quic/core/quic_crypto_server_handshaker.h
+++ b/quic/core/quic_crypto_server_handshaker.h
@@ -31,7 +31,7 @@
                              QuicCryptoServerStream* stream,
                              QuicCompressedCertsCache* compressed_certs_cache,
                              QuicSession* session,
-                             QuicCryptoServerStream::Helper* helper);
+                             QuicCryptoServerStreamBase::Helper* helper);
   QuicCryptoServerHandshaker(const QuicCryptoServerHandshaker&) = delete;
   QuicCryptoServerHandshaker& operator=(const QuicCryptoServerHandshaker&) =
       delete;
@@ -182,7 +182,7 @@
   std::string chlo_hash_;
 
   // Pointer to the helper for this crypto stream. Must outlive this stream.
-  QuicCryptoServerStream::Helper* helper_;
+  QuicCryptoServerStreamBase::Helper* helper_;
 
   // Number of handshake messages received by this stream.
   uint8_t num_handshake_messages_;