Add a bunch of scopers.

I started by switching a couple fields to SSL_HANDSHAKE and then kept
following transitive bits.

Bug: 132
Change-Id: I640dadd3558615fa38c7e8498d4efe7449b0658f
Reviewed-on: https://boringssl-review.googlesource.com/18245
Reviewed-by: Steven Valdez <svaldez@google.com>
Commit-Queue: Steven Valdez <svaldez@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
diff --git a/ssl/ssl_test.cc b/ssl/ssl_test.cc
index 45cebd7..a57298f 100644
--- a/ssl/ssl_test.cc
+++ b/ssl/ssl_test.cc
@@ -1526,8 +1526,8 @@
                                      nullptr /* no session */));
 
   SSL_SESSION *session0 = SSL_get_session(client.get());
-  bssl::UniquePtr<SSL_SESSION> session1(
-      bssl::SSL_SESSION_dup(session0, SSL_SESSION_DUP_ALL));
+  bssl::UniquePtr<SSL_SESSION> session1 =
+      bssl::SSL_SESSION_dup(session0, SSL_SESSION_DUP_ALL);
   ASSERT_TRUE(session1);
 
   session1->not_resumable = 0;