net/http/cgi: remove outdated TODO

Cookies already work as http.Request parses the Cookie header on-demand
when the Cookie methods are called.

Change-Id: Ib7a6f68be02940ff0b56d2465c94545d6fd43847
Reviewed-on: https://go-review.googlesource.com/c/go/+/221417
Reviewed-by: Daniel Martí <[email protected]>
Run-TryBot: Daniel Martí <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>

Author: Tim Cooper

src/net/http/cgi/child.go

@@ -89,8 +89,6 @@ func RequestFromMap(params map[string]string) (*http.Request, error) {
 		r.Header.Add(strings.ReplaceAll(k[5:], "_", "-"), v)
 	}
 
-	// TODO: cookies.  parsing them isn't exported, though.
-
 	uriStr := params["REQUEST_URI"]
 	if uriStr == "" {
 		// Fallback to SCRIPT_NAME, PATH_INFO and QUERY_STRING.