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 3f0847b47d15a6514b28e2738e00580101cf5274..1f3da2b7463fa5de1bac403f8eb7a7bbce26a9cb 100644
--- a/net/quic/test_tools/crypto_test_utils.cc
+++ b/net/quic/test_tools/crypto_test_utils.cc
@@ -228,9 +228,12 @@ 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().
+#if defined(USE_OPENSSL)
+    crypto_config.SetProofVerifier(ProofVerifierForTesting());
+#else
+    // TODO(rch): Implement a NSS proof source.
     crypto_config.SetProofVerifier(FakeProofVerifierForTesting());
+#endif
   }
   TestQuicSpdyClientSession client_session(client_conn, DefaultQuicConfig(),
                                            server_id, &crypto_config);