Make NSSCertDatabase::ListCerts work async on a worker thread.

net/cert/nss_database_filter.cc

+// Copyright 2014 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/nss_database_filter.h"
+
+#include "net/cert/x509_certificate.h"
+
+namespace net {
+
+NSSDatabaseFilter::CertNotAllowedPredicate::CertNotAllowedPredicate(
+    const scoped_refptr<NSSDatabaseFilter>& filter)
+    : filter_(filter) {}
+
+bool NSSDatabaseFilter::CertNotAllowedPredicate::operator()(
+    const scoped_refptr<X509Certificate>& cert) const {
+  return !filter_->IsCertAllowed(cert);
+}
+
+NSSDatabaseFilter::ModuleNotAllowedPredicate::ModuleNotAllowedPredicate(
+    const scoped_refptr<NSSDatabaseFilter>& filter)
+    : filter_(filter) {}
+
+bool NSSDatabaseFilter::ModuleNotAllowedPredicate::operator()(
+    const scoped_refptr<CryptoModule>& module) const {
+  return !filter_->IsModuleAllowed(module->os_module_handle());
+}
+
+NSSDatabaseFilter::NSSDatabaseFilter() {}
+
+NSSDatabaseFilter::~NSSDatabaseFilter() {}
+
+}  // namespace net
+