Make NSSCertDatabase::ListCerts work async on a worker thread.

chrome/browser/certificate_manager_model.cc

Index: chrome/browser/certificate_manager_model.cc
diff --git a/chrome/browser/certificate_manager_model.cc b/chrome/browser/certificate_manager_model.cc
index b8b43faed186f0dbd80c1094ab96fdd459bc29b1..4e71a0fe5cf43e97e6cb9a5180cb96a3e77cdce5 100644
--- a/chrome/browser/certificate_manager_model.cc
+++ b/chrome/browser/certificate_manager_model.cc
@@ -91,7 +91,7 @@ void CertificateManagerModel::Refresh() {
 
 void CertificateManagerModel::RefreshSlotsUnlocked() {
   DVLOG(1) << "refresh listing certs...";

[stevenjb, 2014/02/04 22:28:42]

TODO(): make this async

[tbarzic, 2014/02/04 23:12:38]

Done.

-  cert_db_->ListCerts(&cert_list_);
+  cert_db_->ListCertsSync(&cert_list_);
   observer_->CertificatesRefreshed();
   DVLOG(1) << "refresh finished";
 }