Clarify that ClientCertStoreImpl::SelectClientCerts is testing-only

net/ssl/client_cert_store_impl_nss.cc

Index: net/ssl/client_cert_store_impl_nss.cc
diff --git a/net/ssl/client_cert_store_impl_nss.cc b/net/ssl/client_cert_store_impl_nss.cc
index 62a66cecd10026066bfa146a040b92a451b11433..ffab2680c68d7520a5cc5453706ad03b85fd1904 100644
--- a/net/ssl/client_cert_store_impl_nss.cc
+++ b/net/ssl/client_cert_store_impl_nss.cc
@@ -91,9 +91,10 @@ bool ClientCertStoreImpl::GetClientCerts(const SSLCertRequestInfo& request,
   return rv;
 }
 
-bool ClientCertStoreImpl::SelectClientCerts(const CertificateList& input_certs,
-                                            const SSLCertRequestInfo& request,
-                                            CertificateList* selected_certs) {
+bool ClientCertStoreImpl::SelectClientCertsForTesting(
+    const CertificateList& input_certs,
+    const SSLCertRequestInfo& request,
+    CertificateList* selected_certs) {
   CERTCertList* cert_list = CERT_NewCertList();
   if (!cert_list)
     return false;