Revert of Copy some x509_certificate_model_nss functions to src/chromeos

chromeos/network/certificate_helper.h

Index: chromeos/network/certificate_helper.h
diff --git a/chromeos/network/certificate_helper.h b/chromeos/network/certificate_helper.h
deleted file mode 100644
index 07454788ad6de68e12c8952e46fd16cd9802d6cd..0000000000000000000000000000000000000000
--- a/chromeos/network/certificate_helper.h
+++ /dev/null
@@ -1,46 +0,0 @@
-// Copyright 2017 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 CHROMEOS_NETWORK_CERTIFICATE_HELPER_H_
-#define CHROMEOS_NETWORK_CERTIFICATE_HELPER_H_
-
-#include <cert.h>
-#include <string>
-
-#include "net/cert/cert_type.h"
-#include "net/cert/x509_certificate.h"
-
-namespace chromeos {
-namespace certificate {
-
-// Selected functions from chrome/common/net/x509_certificate_model.cc
-
-// Decodes the certificate type from |cert|.
-net::CertType GetCertType(net::X509Certificate::OSCertHandle cert_handle);
-
-// Extracts the token name from |cert|->slot if it exists or returns an empty
-// string.
-std::string GetCertTokenName(net::X509Certificate::OSCertHandle cert_handle);
-
-// Returns the common name for |cert_handle|->issuer or |alternative_text| if
-// the common name is missing or empty.
-std::string GetIssuerCommonName(net::X509Certificate::OSCertHandle cert_handle,
-                                const std::string& alternative_text);
-
-// Returns the common name for |cert_handle|->subject converted to unicode,
-// or |cert_handle|->nickname if the subject name is unavailable or empty.
-// NOTE: Unlike x509_certificate_model::GetCertNameOrNickname in src/chrome,
-// the raw unformated name or nickname will not be included in the returned
-// value (see GetCertAsciiNameOrNickname instead).
-std::string GetCertNameOrNickname(
-    net::X509Certificate::OSCertHandle cert_handle);
-
-// Returns the unformated ASCII common name for |cert_handle|->subject.
-std::string GetCertAsciiNameOrNickname(
-    net::X509Certificate::OSCertHandle cert_handle);
-
-}  // namespace certificate
-}  // namespace chromeos
-
-#endif  // CHROMEOS_NETWORK_CERTIFICATE_HELPER_H_