Delete TLS version fallback code in net/http.

net/http/http_network_transaction.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 NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 #define NET_HTTP_HTTP_NETWORK_TRANSACTION_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 312 matching lines @@
   ProxyInfo proxy_info_;
 
   std::unique_ptr<HttpStreamRequest> stream_request_;
   std::unique_ptr<HttpStream> stream_;
 
   // True if we've validated the headers that the stream parser has returned.
   bool headers_valid_;
 
   SSLConfig server_ssl_config_;
   SSLConfig proxy_ssl_config_;
-  // fallback_error_code contains the error code that caused the last TLS
-  // fallback. If the fallback connection results in
-  // ERR_SSL_INAPPROPRIATE_FALLBACK (i.e. the server indicated that the
-  // fallback should not have been needed) then we use this value to return the
-  // original error that triggered the fallback.
-  int fallback_error_code_;
 
   // Keys to use for signing message in Token Binding header.
   std::unique_ptr<crypto::ECPrivateKey> provided_token_binding_key_;
   std::unique_ptr<crypto::ECPrivateKey> referred_token_binding_key_;
   // Object to manage lookup of |provided_token_binding_key_| and
   // |referred_token_binding_key_|.
   ChannelIDService::Request token_binding_request_;
 
   HttpRequestHeaders request_headers_;
 
@@ skipping 37 matching lines @@
   ConnectionAttempts connection_attempts_;
   IPEndPoint remote_endpoint_;
   // Network error details for this transaction.
   NetErrorDetails net_error_details_;
   DISALLOW_COPY_AND_ASSIGN(HttpNetworkTransaction);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_NETWORK_TRANSACTION_H_