Use SecKeyCreateSignature on macOS 10.12 and later.

net/ssl/ssl_platform_key_win.cc

 // Copyright 2015 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/ssl_platform_key.h"
 
 #include <windows.h>
 #include <NCrypt.h>
 
 #include <algorithm>
@@ skipping 230 matching lines @@
   NCRYPT_KEY_HANDLE key_;
   SSLPrivateKey::Type type_;
   size_t max_length_;
 
   DISALLOW_COPY_AND_ASSIGN(SSLPlatformKeyCNG);
 };
 
 }  // namespace
 
 scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
-    X509Certificate* certificate) {
+    const X509Certificate* certificate) {
   // Rather than query the private key for metadata, extract the public key from
   // the certificate without using Windows APIs. CAPI and CNG do not
   // consistently work depending on the system. See https://crbug.com/468345.
   SSLPrivateKey::Type key_type;
   size_t max_length;
   if (!GetClientCertInfo(certificate, &key_type, &max_length))
     return nullptr;
 
   PCCERT_CONTEXT cert_context = certificate->os_cert_handle();
 
@@ skipping 17 matching lines @@
     delegate.reset(new SSLPlatformKeyCNG(prov_or_key, key_type, max_length));
   } else {
     DCHECK(SSLPrivateKey::Type::RSA == key_type);
     delegate.reset(new SSLPlatformKeyCAPI(prov_or_key, key_spec, max_length));
   }
   return make_scoped_refptr(new ThreadedSSLPrivateKey(
       std::move(delegate), GetSSLPlatformKeyTaskRunner()));
 }
 
 }  // namespace net