Move the NSS functions out of CertDatabase into a new NSSCertDatabase class.

net/base/cert_database_openssl.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 <openssl/x509.h>
 
 #include "base/logging.h"
 #include "net/base/crypto_module.h"
 #include "net/base/net_errors.h"
 #include "net/base/openssl_private_key_store.h"
 #include "net/base/x509_certificate.h"
 
 namespace net {
 
-CertDatabase::CertDatabase() {
-}
-
 int CertDatabase::CheckUserCert(X509Certificate* cert) {
   if (!cert)
     return ERR_CERT_INVALID;
   if (cert->HasExpired())
     return ERR_CERT_DATE_INVALID;
 
   if (!OpenSSLPrivateKeyStore::GetInstance()->FetchPrivateKey(
       X509_PUBKEY_get(X509_get_X509_PUBKEY(cert->os_cert_handle()))))
     return ERR_NO_PRIVATE_KEY_FOR_CERT;
 
   return OK;
 }
 
 int CertDatabase::AddUserCert(X509Certificate* cert) {
   // TODO(bulach): implement me.
   NOTIMPLEMENTED();
   return ERR_NOT_IMPLEMENTED;
 }
 
 }  // namespace net