gfe-relnote: Honor IETF QUIC initial flow control limits when using TLS. Protected by disabled --gfe2_reloadable_flag_quic_supports_tls_handshake

PiperOrigin-RevId: 268605601
Change-Id: If7e0d3e59a30197d4bc9c681b988bd7251074395
diff --git a/quic/core/http/quic_headers_stream_test.cc b/quic/core/http/quic_headers_stream_test.cc
index b5385b7..2f2db8d 100644
--- a/quic/core/http/quic_headers_stream_test.cc
+++ b/quic/core/http/quic_headers_stream_test.cc
@@ -321,6 +321,7 @@
   }
 
   void CheckHeaders() {
+    ASSERT_TRUE(headers_handler_);
     EXPECT_EQ(headers_, headers_handler_->decoded_block());
     headers_handler_.reset();
   }