Implement an openssl version of a QUIC ProofSource.

net/quic/test_tools/crypto_test_utils.cc

Index: net/quic/test_tools/crypto_test_utils.cc
diff --git a/net/quic/test_tools/crypto_test_utils.cc b/net/quic/test_tools/crypto_test_utils.cc
index 811da803f1a59c3e60021afc2c6155436fa2a242..372923d21f4439177aba7a1029c045b2e685d496 100644
--- a/net/quic/test_tools/crypto_test_utils.cc
+++ b/net/quic/test_tools/crypto_test_utils.cc
@@ -228,9 +228,7 @@ int CryptoTestUtils::HandshakeWithFakeClient(
   QuicServerId server_id(kServerHostname, kServerPort, is_https,
                          PRIVACY_MODE_DISABLED);
   if (!options.dont_verify_certs) {
-    // TODO(wtc): replace this with ProofVerifierForTesting() when we have
-    // a working ProofSourceForTesting().
-    crypto_config.SetProofVerifier(FakeProofVerifierForTesting());
+    crypto_config.SetProofVerifier(ProofVerifierForTesting());
   }
   TestQuicSpdyClientSession client_session(client_conn, DefaultQuicConfig(),
                                            server_id, &crypto_config);