Create stubs for system certificate validation.

net/base/cert_verify_proc_nss.h

Index: net/base/cert_verify_proc_nss.h
diff --git a/net/base/cert_verify_proc_nss.h b/net/base/cert_verify_proc_nss.h
new file mode 100644
index 0000000000000000000000000000000000000000..48641a45957ff6b584b0411c0c6d2bee85f0f45f
--- /dev/null
+++ b/net/base/cert_verify_proc_nss.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef NET_BASE_CERT_VERIFY_PROC_NSS_H_
+#define NET_BASE_CERT_VERIFY_PROC_NSS_H_
+#pragma once
+
+#include "net/base/multi_threaded_cert_verifier.h"
+
+namespace net {
+
+// CertVerifyProcNSS is a VerifyProc implementation that verifies certificates
+// using NSS's libpkix for path building and verification.
+class CertVerifyProcNSS : public MultiThreadedCertVerifier::VerifyProc {
+ public:
+  CertVerifyProcNSS();
+
+  // MultiThreadedCertVerifier::VerifyProc implementation.
+  virtual int Verify(X509Certificate* cert,
+                     const std::string& hostname,
+                     int flags,
+                     CRLSet* crl_set,
+                     CertVerifyResult* verify_result) OVERRIDE;
+
+ protected:
+  virtual ~CertVerifyProcNSS();
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_CERT_VERIFY_PROC_NSS_H_