fix js compilation

Change-Id: Ied50ee0a22e5cdee3e4a69bc89a27decf09e20a9

Author: mateusz834

Diff for: src/net/net_fake_js.go

@@ -9,10 +9,7 @@
 package net
 
 import (
-	"context"
 	"internal/poll"
-
-	"golang.org/x/net/dns/dnsmessage"
 )
 
 // Network file descriptor.
@@ -30,7 +27,3 @@ type netFD struct {
 	pfd         poll.FD
 	isConnected bool // handshake completed or use of association with peer
 }
-
-func (r *Resolver) lookup(ctx context.Context, name string, qtype dnsmessage.Type, conf *dnsConfig) (dnsmessage.Parser, string, error) {
-	panic("unreachable")
-}