Minor refactors to enable sending an Expect-CT header more easily.

net/quic/core/crypto/quic_crypto_proof.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_QUIC_CORE_CRYPTO_QUIC_CRYPTO_PROOF_H_
 #define NET_QUIC_CORE_CRYPTO_QUIC_CRYPTO_PROOF_H_
 
 #include <string>
 
+#include "net/base/net_export.h"
+
 namespace net {
 
 // Contains the crypto-related data provided by ProofSource
-struct QuicCryptoProof {
+struct NET_EXPORT_PRIVATE QuicCryptoProof {
+  QuicCryptoProof();
+
   // Signature generated by ProofSource
   std::string signature;
   // SCTList (RFC6962) to be sent to the client, if it supports receiving it.
   std::string leaf_cert_scts;
+  // Should the Expect-CT header be sent on the connection where the
+  // certificate is used.
+  bool send_expect_ct_header;
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_CORE_CRYPTO_QUIC_CRYPTO_PROOF_H_