Add X509CertificateBytes which uses CRYPTO_BUFFER instead of macOS-native certificate types.

net/ssl/ssl_platform_key_mac_unittest.cc

Index: net/ssl/ssl_platform_key_mac_unittest.cc
diff --git a/net/ssl/ssl_platform_key_mac_unittest.cc b/net/ssl/ssl_platform_key_mac_unittest.cc
index 9207dedb086f914c6ac99ad7f74d511d8165e4c0..e35af63b99ccfa3f33027fc320e02976b74849f2 100644
--- a/net/ssl/ssl_platform_key_mac_unittest.cc
+++ b/net/ssl/ssl_platform_key_mac_unittest.cc
@@ -16,6 +16,7 @@
 #include "base/files/scoped_temp_dir.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/ref_counted.h"
+#include "net/cert/x509_util_mac.h"
 #include "net/ssl/ssl_private_key.h"
 #include "net/ssl/ssl_private_key_test_util.h"
 #include "net/test/cert_test_util.h"
@@ -76,8 +77,10 @@ TEST_P(SSLPlatformKeyMacTest, KeyMatches) {
                               nullptr, keychain.InitializeInto()));
 
   // Insert the certificate into the keychain.
-  ASSERT_EQ(noErr,
-            SecCertificateAddToKeychain(cert->os_cert_handle(), keychain));
+  base::ScopedCFTypeRef<SecCertificateRef> sec_cert(
+      x509_util::CreateSecCertificateFromX509Certificate(cert.get()));
+  ASSERT_TRUE(sec_cert);
+  ASSERT_EQ(noErr, SecCertificateAddToKeychain(sec_cert, keychain));
 
   // Import the key into the keychain. Apple doesn't accept unencrypted PKCS#8,
   // but it accepts the low-level RSAPrivateKey and ECPrivateKey types as