Remove cookie_len setting in dtls1_new.

This should have been removed with its dtls1_clear cousin in
8c88153465ed4eb657ffc8dedd9d37f72ad3d87d.

Change-Id: Ibf4ee67348f603285b26766568cbb92183b62cee
Reviewed-on: https://boringssl-review.googlesource.com/2823
Reviewed-by: Adam Langley <agl@google.com>

ssl/d1_lib.c

diff --git a/ssl/d1_lib.c b/ssl/d1_lib.c
index ce05b89..e4c2a2b 100644
--- a/ssl/d1_lib.c
+++ b/ssl/d1_lib.c
@@ -134,10 +134,6 @@
   d1->sent_messages = pqueue_new();
   d1->buffered_app_data.q = pqueue_new();
 
-  if (s->server) {
-    d1->cookie_len = sizeof(s->d1->cookie);
-  }
-
   if (!d1->unprocessed_rcds.q || !d1->processed_rcds.q ||
       !d1->buffered_messages || !d1->sent_messages ||
       !d1->buffered_app_data.q) {