Refactor client cert private key handling.

net/ssl/test_ssl_private_key.cc

Index: net/ssl/test_ssl_private_key.cc
diff --git a/net/ssl/test_ssl_private_key.cc b/net/ssl/test_ssl_private_key.cc
index 687617885e947ba5b0b5a86fca2f0542d2385d53..732e2ea0fb2bd508272e563ae1cd113007a98ea9 100644
--- a/net/ssl/test_ssl_private_key.cc
+++ b/net/ssl/test_ssl_private_key.cc
@@ -9,6 +9,7 @@
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "crypto/rsa_private_key.h"
 #include "net/base/net_errors.h"
 #include "net/ssl/ssl_platform_key_util.h"
 #include "net/ssl/ssl_private_key.h"
@@ -108,4 +109,11 @@ scoped_refptr<SSLPrivateKey> WrapOpenSSLPrivateKey(
       GetSSLPlatformKeyTaskRunner()));
 }
 
+scoped_refptr<SSLPrivateKey> WrapRSAPrivateKey(
+    crypto::RSAPrivateKey* rsa_private_key) {
+  EVP_PKEY_up_ref(rsa_private_key->key());
+  return net::WrapOpenSSLPrivateKey(
+      bssl::UniquePtr<EVP_PKEY>(rsa_private_key->key()));
+}
+
 }  // namespace net