Clarify that ClientCertStoreImpl::SelectClientCerts is testing-only

net/ssl/client_cert_store_impl_win.cc

Index: net/ssl/client_cert_store_impl_win.cc
diff --git a/net/ssl/client_cert_store_impl_win.cc b/net/ssl/client_cert_store_impl_win.cc
index d6df838f1eb4c6fe42947dcbf843cf6e98c2e139..63ea6e4a875c306ec8075c43295925cdbd0e1d50 100644
--- a/net/ssl/client_cert_store_impl_win.cc
+++ b/net/ssl/client_cert_store_impl_win.cc
@@ -160,9 +160,10 @@ 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) {
   typedef crypto::ScopedCAPIHandle<
       HCERTSTORE,
       crypto::CAPIDestroyerWithFlags<HCERTSTORE,