Remove support for the keygen tag

net/base/keygen_handler.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"
-
-#if defined(USE_NSS_CERTS)
-#include "crypto/nss_crypto_module_delegate.h"
-#endif  // defined(USE_NSS_CERTS)
-
-namespace net {
-
-// The constructor and destructor must be defined in a .cc file so that
-// CryptoModuleBlockingPasswordDelegate can be forward-declared on platforms
-// which use NSS.
-
-KeygenHandler::KeygenHandler(int key_size_in_bits,
-                             const std::string& challenge,
-                             const GURL& url)
-    : key_size_in_bits_(key_size_in_bits),
-      challenge_(challenge),
-      url_(url),
-      stores_key_(true) {
-}
-
-KeygenHandler::~KeygenHandler() {
-}
-
-}  // namespace net