Make CertVerifier a pure virtual interface.

net/base/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/base/cert_database.h"
 
 #include "base/memory/singleton.h"
 #include "base/observer_list_threadsafe.h"
-#include "net/base/x509_certificate.h"
 
 namespace net {
 
 CertDatabase::ImportCertFailure::ImportCertFailure(
     X509Certificate* cert, int err)
     : certificate(cert), net_error(err) {
 }
 
 CertDatabase::ImportCertFailure::~ImportCertFailure() {
 }
@@ skipping 37 matching lines @@
       &CertDatabase::Observer::OnUserCertRemoved, make_scoped_refptr(cert));
 }
 
 void CertDatabase::NotifyObserversOfCertTrustChanged(
     const X509Certificate* cert) {
   CertDatabaseNotifier::GetInstance()->observer_list_->Notify(
       &CertDatabase::Observer::OnCertTrustChanged, make_scoped_refptr(cert));
 }
 
 }  // namespace net