Refactor TlsHandshaker classes

QuicCryptoClientConfig and QuicCryptoServerConfig each own an SSL_CTX,
which is currently created by TlsHandshaker. Those crypto config classes
can't take a dependency on TlsHandshaker (because TlsHandshaker depends on
classes have a dependency in the other direction), resulting in the SSL_CTX
being passed into the crypto config constructors. The SSL_CTX shouldn't be
exposed like this, as it's essentially an implementation detail of the
crypto handshake.

This CL splits TlsHandshaker in two. TlsConnection (and its subclasses) are
in quic/core/crypto, and handle the callbacks from BoringSSL. In turn, it
passes the implementation of those callbacks to a delegate. TlsHandshaker
implements this delegate and owns the TlsConnection.

gfe-relnote: refactor TLS handshake classes in QUIC; not flag protected
PiperOrigin-RevId: 253140899
Change-Id: Ie907a7f61798c29a385be15ea0f53403b86508ab
diff --git a/quic/core/quic_crypto_server_stream_test.cc b/quic/core/quic_crypto_server_stream_test.cc
index 5105a27..238162c 100644
--- a/quic/core/quic_crypto_server_stream_test.cc
+++ b/quic/core/quic_crypto_server_stream_test.cc
@@ -21,8 +21,6 @@
 #include "net/third_party/quiche/src/quic/core/quic_packets.h"
 #include "net/third_party/quiche/src/quic/core/quic_session.h"
 #include "net/third_party/quiche/src/quic/core/quic_utils.h"
-#include "net/third_party/quiche/src/quic/core/tls_client_handshaker.h"
-#include "net/third_party/quiche/src/quic/core/tls_server_handshaker.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_flags.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_logging.h"
 #include "net/third_party/quiche/src/quic/platform/api/quic_ptr_util.h"
@@ -60,13 +58,11 @@
       : server_crypto_config_(QuicCryptoServerConfig::TESTING,
                               QuicRandom::GetInstance(),
                               std::move(proof_source),
-                              KeyExchangeSource::Default(),
-                              TlsServerHandshaker::CreateSslCtx()),
+                              KeyExchangeSource::Default()),
         server_compressed_certs_cache_(
             QuicCompressedCertsCache::kQuicCompressedCertsCacheSize),
         server_id_(kServerHostname, kServerPort, false),
-        client_crypto_config_(crypto_test_utils::ProofVerifierForTesting(),
-                              TlsClientHandshaker::CreateSslCtx()) {}
+        client_crypto_config_(crypto_test_utils::ProofVerifierForTesting()) {}
 
   void Initialize() { InitializeServer(); }