Remove OnCertDBChanged |cert| parameter.

net/cert/cert_database.cc

Index: net/cert/cert_database.cc
diff --git a/net/cert/cert_database.cc b/net/cert/cert_database.cc
index d2ef9ffdf4a5c3f2f6e478634a220d6f847ffca2..51f0005b20580cce609e07c2947e458355c1cd38 100644
--- a/net/cert/cert_database.cc
+++ b/net/cert/cert_database.cc
@@ -25,9 +25,8 @@ void CertDatabase::RemoveObserver(Observer* observer) {
   observer_list_->RemoveObserver(observer);
 }
 
-void CertDatabase::NotifyObserversCertDBChanged(const X509Certificate* cert) {
-  observer_list_->Notify(FROM_HERE, &Observer::OnCertDBChanged,
-                         base::RetainedRef(cert));
+void CertDatabase::NotifyObserversCertDBChanged() {
+  observer_list_->Notify(FROM_HERE, &Observer::OnCertDBChanged);
 }
 
 }  // namespace net