Switch to using SSL_get0_certificate_types for client auth.

Upstream added SSL_get0_certificate_types while we added
SSL_get_client_certificate_types in parallel. Switch to upstream's API.

BUG=388000

Review URL: https://codereview.chromium.org/415853002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285498 0039d316-1c4b-4281-b951-d872f2087c98

net/socket/ssl_client_socket_openssl.cc

@@ -1339,9 +1339,8 @@ int SSLClientSocketOpenSSL::ClientCertRequestCallback(SSL* ssl,
     }
 
     const unsigned char* client_cert_types;
-    size_t num_client_cert_types;
-    SSL_get_client_certificate_types(ssl, &client_cert_types,
-                                     &num_client_cert_types);
+    size_t num_client_cert_types =
+        SSL_get0_certificate_types(ssl, &client_cert_types);
     for (size_t i = 0; i < num_client_cert_types; i++) {
       cert_key_types_.push_back(
           static_cast<SSLClientCertType>(client_cert_types[i]));