Use SecKeyCreateSignature on macOS 10.12 and later.

net/ssl/ssl_platform_key_android.cc

Index: net/ssl/ssl_platform_key_android.cc
diff --git a/net/ssl/ssl_platform_key_android.cc b/net/ssl/ssl_platform_key_android.cc
index 492c094b3bd34284098d2795b0702055fc8bb257..136c63ad8228f29835863077b2e5c07f2b521364 100644
--- a/net/ssl/ssl_platform_key_android.cc
+++ b/net/ssl/ssl_platform_key_android.cc
@@ -223,7 +223,7 @@ scoped_refptr<SSLPrivateKey> WrapJavaPrivateKey(
 }
 
 scoped_refptr<SSLPrivateKey> FetchClientCertPrivateKey(
-    X509Certificate* certificate) {
+    const X509Certificate* certificate) {
   return OpenSSLClientKeyStore::GetInstance()->FetchClientCertPrivateKey(
       certificate);
 }