Cleanup unreachable cert adding code

chrome/browser/ssl/ssl_add_certificate.h

-// 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 CHROME_BROWSER_SSL_SSL_ADD_CERTIFICATE_H_
-#define CHROME_BROWSER_SSL_SSL_ADD_CERTIFICATE_H_
-
-#include <stddef.h>
-
-#include "net/base/mime_util.h"
-
-namespace net {
-class URLRequest;
-}  // namespace net
-
-namespace chrome {
-
-// This method is used to add a new certificate file.
-//
-void SSLAddCertificate(
-    net::CertificateMimeType cert_type,
-    const void* cert_data,
-    size_t cert_size,
-    int render_process_id,
-    int render_view_id);
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_SSL_SSL_ADD_CERTIFICATE_H_