relnote: n/a (comment only). Add comment about |proof_source|, adds

net/quic/crypto/quic_crypto_server_config.h

Index: net/quic/crypto/quic_crypto_server_config.h
diff --git a/net/quic/crypto/quic_crypto_server_config.h b/net/quic/crypto/quic_crypto_server_config.h
index 4883e3329bab801092a36cae6f8e93952fa973e9..02d0523348589ea6c5505079c61f63afdeaddbb8 100644
--- a/net/quic/crypto/quic_crypto_server_config.h
+++ b/net/quic/crypto/quic_crypto_server_config.h
@@ -143,7 +143,9 @@ class NET_EXPORT_PRIVATE QuicCryptoServerConfig {
   //     into a KDF before use. In tests, use TESTING.
   // |server_nonce_entropy|: an entropy source used to generate the orbit and
   //     key for server nonces, which are always local to a given instance of a
-  //     server.
+  //     server. Not owned.
+  // |proof_source|: provides certificate chains and signatures. This class
+  //     takes ownership of |proof_source|.
   QuicCryptoServerConfig(base::StringPiece source_address_token_secret,
                          QuicRandom* server_nonce_entropy,
                          ProofSource* proof_source);