Revert "Add new TCPBufferSize parameter to network"

This reverts commit 57cb1b5aa0.

network/socks5.go

@@ -2,34 +2,16 @@ package network
 
 import (
 	"fmt"
-	"net"
 	"net/url"
 
 	"golang.org/x/net/proxy"
 )
 
-type socks5Dialer struct {
-	proxy.ContextDialer
-
-	bufferSize int
-}
-
-func (s socks5Dialer) Dial(protocol, address string) (net.Conn, error) {
-	return s.ContextDialer.(proxy.Dialer).Dial(protocol, address)
-}
-
-func (s socks5Dialer) TCPBufferSize() int {
-	return s.bufferSize
-}
-
 func NewSocks5Dialer(baseDialer Dialer, proxyURL *url.URL) (Dialer, error) {
 	rv, err := proxy.FromURL(proxyURL, baseDialer)
 	if err != nil {
 		return nil, fmt.Errorf("cannot initialize socks5 proxy dialer: %w", err)
 	}
 
-	return socks5Dialer{
-		ContextDialer: rv.(proxy.ContextDialer),
-		bufferSize:    baseDialer.TCPBufferSize(),
-	}, nil
+	return rv.(Dialer), nil
 }