Improve logging of QuicCryptoFrame

gfe-relnote: log-only change, not protected
PiperOrigin-RevId: 305952537
Change-Id: I5e8bd790f6dce8092166f83b6f439e8cae54f91d

quic/core/frames/quic_crypto_frame.cc

diff --git a/quic/core/frames/quic_crypto_frame.cc b/quic/core/frames/quic_crypto_frame.cc
index d750da7..6fd9be8 100644
--- a/quic/core/frames/quic_crypto_frame.cc
+++ b/quic/core/frames/quic_crypto_frame.cc
@@ -35,7 +35,7 @@
 
 std::ostream& operator<<(std::ostream& os,
                          const QuicCryptoFrame& stream_frame) {
-  os << "{ level: " << static_cast<int>(stream_frame.level)
+  os << "{ level: " << EncryptionLevelToString(stream_frame.level)
      << ", offset: " << stream_frame.offset
      << ", length: " << stream_frame.data_length << " }\n";
   return os;