Delete TLS version fallback code in net/http.

net/http/http_network_transaction.h

Index: net/http/http_network_transaction.h
diff --git a/net/http/http_network_transaction.h b/net/http/http_network_transaction.h
index bb606d837b27ae313ec498cfe1f64ca38ac83871..87dc819ec619c8aa9faf3bde2428840429f1b021 100644
--- a/net/http/http_network_transaction.h
+++ b/net/http/http_network_transaction.h
@@ -330,12 +330,6 @@ class NET_EXPORT_PRIVATE HttpNetworkTransaction
 
   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_;