Refactor client cert private key handling.

net/ssl/client_cert_identity_mac.h

+// Copyright 2017 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_SSL_SSL_CLIENT_CERT_IDENTITY_MAC_H_
+#define NET_SSL_SSL_CLIENT_CERT_IDENTITY_MAC_H_
+
+#include "net/ssl/client_cert_identity.h"
+
+#include <Security/SecBase.h>
+
+#include "base/mac/scoped_cftyperef.h"
+#include "net/base/net_export.h"
+
+namespace net {
+
+class NET_EXPORT_PRIVATE ClientCertIdentityMac : public ClientCertIdentity {
+ public:
+  ClientCertIdentityMac(scoped_refptr<net::X509Certificate> cert,
+                        base::ScopedCFTypeRef<SecIdentityRef> sec_identity);
+  ~ClientCertIdentityMac() override;
+
+  void AcquirePrivateKey(
+      const base::Callback<void(scoped_refptr<SSLPrivateKey>)>&
+          private_key_callback) override;
+  SecIdentityRef sec_identity_ref() const override;
+
+ private:
+  base::ScopedCFTypeRef<SecIdentityRef> identity_;
+};
+
+}  // namespace net
+
+#endif  // NET_SSL_SSL_CLIENT_CERT_IDENTITY_MAC_H_