Create stubs for system certificate validation.

net/base/cert_verify_proc_mac.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_verify_proc_mac.h"
+
+#include "net/base/x509_certificate.h"
+
+namespace net {
+
+CertVerifyProcMac::CertVerifyProcMac() {}
+
+int CertVerifyProcMac::Verify(X509Certificate* cert,
+                              const std::string& hostname,
+                              int flags,
+                              CRLSet* crl_set,
+                              CertVerifyResult* verify_result) {
+  return cert->Verify(hostname, flags, crl_set, verify_result);
+}
+
+CertVerifyProcMac::~CertVerifyProcMac() {}
+
+}  // namespace net