Give DTLS1_STATE a destructor.

Change-Id: I3fb797bad91caf7d2aff09313734edfb58fb9f26
Reviewed-on: https://boringssl-review.googlesource.com/22066
Reviewed-by: Steven Valdez <svaldez@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
diff --git a/ssl/dtls_method.cc b/ssl/dtls_method.cc
index c64c75e..91a955f 100644
--- a/ssl/dtls_method.cc
+++ b/ssl/dtls_method.cc
@@ -105,8 +105,7 @@
                  sizeof(ssl->s3->write_sequence));
   OPENSSL_memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence));
 
-  Delete(ssl->d1->last_aead_write_ctx);
-  ssl->d1->last_aead_write_ctx = ssl->s3->aead_write_ctx.release();
+  ssl->d1->last_aead_write_ctx = std::move(ssl->s3->aead_write_ctx);
   ssl->s3->aead_write_ctx = std::move(aead_ctx);
   return true;
 }