Refactor client cert private key handling.

net/url_request/url_request_job.cc

Index: net/url_request/url_request_job.cc
diff --git a/net/url_request/url_request_job.cc b/net/url_request/url_request_job.cc
index e2082525ce6b467c6144dedf3a81d6ddd7a75902..7a776d37d7a25b063c363e0d607f9f662946c4a3 100644
--- a/net/url_request/url_request_job.cc
+++ b/net/url_request/url_request_job.cc
@@ -320,8 +320,9 @@ void URLRequestJob::CancelAuth() {
   NOTREACHED();
 }
 
-void URLRequestJob::ContinueWithCertificate(X509Certificate* client_cert,
-                                            SSLPrivateKey* client_private_key) {
+void URLRequestJob::ContinueWithCertificate(
+    scoped_refptr<X509Certificate> client_cert,
+    scoped_refptr<SSLPrivateKey> client_private_key) {
   // The derived class should implement this!
   NOTREACHED();
 }