Remove support for the keygen tag

net/base/keygen_handler_nss.cc

-// Copyright (c) 2011 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/keygen_handler.h"
-
-#include <utility>
-
-#include "base/logging.h"
-#include "crypto/nss_crypto_module_delegate.h"
-#include "crypto/nss_util.h"
-#include "crypto/scoped_nss_types.h"
-#include "net/third_party/mozilla_security_manager/nsKeygenHandler.h"
-
-// PSM = Mozilla's Personal Security Manager.
-namespace psm = mozilla_security_manager;
-
-namespace net {
-
-std::string KeygenHandler::GenKeyAndSignChallenge() {
-  crypto::EnsureNSSInit();
-
-  crypto::ScopedPK11Slot slot;
-  if (crypto_module_delegate_) {
-    slot = crypto_module_delegate_->RequestSlot();
-  } else {
-    LOG(ERROR) << "Could not get an NSS key slot.";
-    return std::string();
-  }
-
-  // Authenticate to the token.
-  if (SECSuccess != PK11_Authenticate(slot.get(),
-                                      PR_TRUE,
-                                      crypto_module_delegate_->wincx())) {
-    LOG(ERROR) << "Could not authenticate to the key slot.";
-    return std::string();
-  }
-
-  return psm::GenKeyAndSignChallenge(key_size_in_bits_, challenge_, url_,
-                                     slot.get(), stores_key_);
-}
-
-void KeygenHandler::set_crypto_module_delegate(
-    std::unique_ptr<crypto::NSSCryptoModuleDelegate> delegate) {
-  crypto_module_delegate_ = std::move(delegate);
-}
-
-}  // namespace net