Uniquify QuicCryptoServerConfig::Add[Default]Config

gfe-relnote: Use unique_ptr for memory management rather than bare pointer. No functional change intended, not flag-protected.
PiperOrigin-RevId: 238574036
Change-Id: I0bb803fb9d68925ecbfdf113ba70335a66b3f099
diff --git a/quic/tools/quic_simple_server_session_test.cc b/quic/tools/quic_simple_server_session_test.cc
index 3ccd9e4..7203f12 100644
--- a/quic/tools/quic_simple_server_session_test.cc
+++ b/quic/tools/quic_simple_server_session_test.cc
@@ -216,9 +216,9 @@
         config_, connection_, &owner_, &stream_helper_, &crypto_config_,
         &compressed_certs_cache_, &memory_cache_backend_);
     MockClock clock;
-    handshake_message_.reset(crypto_config_.AddDefaultConfig(
+    handshake_message_ = crypto_config_.AddDefaultConfig(
         QuicRandom::GetInstance(), &clock,
-        QuicCryptoServerConfig::ConfigOptions()));
+        QuicCryptoServerConfig::ConfigOptions());
     session_->Initialize();
     QuicSessionPeer::GetMutableCryptoStream(session_.get())
         ->OnSuccessfulVersionNegotiation(supported_versions.front());