Use Span/Array for ticket decryption.

This isn't actually shorter, but there is a bunch of slicing up of the ticket,
which Span makes a little easier to follow.

Change-Id: I7ea4dfe025641a3b88e2c9b8e34246fefc23412f
Reviewed-on: https://boringssl-review.googlesource.com/29865
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/tls13_server.cc b/ssl/tls13_server.cc
index 203e704..a3940b6 100644
--- a/ssl/tls13_server.cc
+++ b/ssl/tls13_server.cc
@@ -313,8 +313,7 @@
   bool unused_renew;
   UniquePtr<SSL_SESSION> session;
   enum ssl_ticket_aead_result_t ret =
-      ssl_process_ticket(hs, &session, &unused_renew, CBS_data(&ticket),
-                         CBS_len(&ticket), NULL, 0);
+      ssl_process_ticket(hs, &session, &unused_renew, ticket, {});
   switch (ret) {
     case ssl_ticket_aead_success:
       break;