Remove OnCertDBChanged |cert| parameter.

net/cert/cert_database_android.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/logging.h"
 #include "base/observer_list_threadsafe.h"
 #include "net/base/net_errors.h"
 #include "net/ssl/openssl_client_key_store.h"
 
 namespace net {
 
 CertDatabase::CertDatabase()
     : observer_list_(new base::ObserverListThreadSafe<Observer>) {
 }
 
 CertDatabase::~CertDatabase() {}
 
 void CertDatabase::OnAndroidKeyStoreChanged() {
-  NotifyObserversCertDBChanged(NULL);
+  NotifyObserversCertDBChanged();
   // Dump the OpenSSLClientKeyStore to drop references to now disconnected
   // PrivateKeys stored in the in-memory key store. Note: this assumes that
   // every SSLClientAuthCache is dumped as part of notifying
   // OnCertDBChanged. Otherwise client auth decisions will be silently converted
   // to no-certificate decisions. See https://crbug.com/382696
   OpenSSLClientKeyStore::GetInstance()->Flush();
 }
 
 void CertDatabase::OnAndroidKeyChainChanged() {
-  observer_list_->Notify(FROM_HERE, &Observer::OnCertDBChanged, nullptr);
+  observer_list_->Notify(FROM_HERE, &Observer::OnCertDBChanged);
 }
 
 }  // namespace net