Remove OnCertDBChanged |cert| parameter.

net/cert/cert_database.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/cert/cert_database.h"
 
 #include "base/memory/singleton.h"
 #include "base/observer_list_threadsafe.h"
 
 namespace net {
 
 // static
 CertDatabase* CertDatabase::GetInstance() {
   // Leaky so it can be initialized on worker threads, and because there is no
   // useful cleanup to do.
   return base::Singleton<CertDatabase,
                          base::LeakySingletonTraits<CertDatabase>>::get();
 }
 
 void CertDatabase::AddObserver(Observer* observer) {
   observer_list_->AddObserver(observer);
 }
 
 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