Refactor client cert private key handling.

net/ssl/client_cert_identity_mac.cc

+// 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.
+
+#include "net/ssl/client_cert_identity_mac.h"
+
+#include "net/ssl/ssl_platform_key_mac.h"
+#include "net/ssl/ssl_private_key.h"
+
+namespace net {
+
+ClientCertIdentityMac::ClientCertIdentityMac(
+    scoped_refptr<net::X509Certificate> cert,
+    base::ScopedCFTypeRef<SecIdentityRef> sec_identity)
+    : ClientCertIdentity(std::move(cert)), identity_(std::move(sec_identity)) {}
+
+ClientCertIdentityMac::~ClientCertIdentityMac() = default;
+
+void ClientCertIdentityMac::AcquirePrivateKey(
+    const base::Callback<void(scoped_refptr<SSLPrivateKey>)>&
+        private_key_callback) {
+  // This only adds a ref to and returns the private key from identity_ so it
+  // doesn't need to run on a worker thread.
+  private_key_callback.Run(
+      CreateSSLPrivateKeyForSecIdentity(certificate(), identity_.get()));
+}
+
+SecIdentityRef ClientCertIdentityMac::sec_identity_ref() const {
+  return identity_.get();
+}
+
+}  // namespace net