godoc: remove disabled admin code

Change-Id: If3e2264b874c7a5447929888fed0ce6ad61f3475
Reviewed-on: https://go-review.googlesource.com/52291
Reviewed-by: Chris Broadfoot <cbro@golang.org>

godoc/dl/dl.go

@@ -32,7 +32,6 @@ import (
 	"google.golang.org/appengine/datastore"
 	"google.golang.org/appengine/log"
 	"google.golang.org/appengine/memcache"
-	"google.golang.org/appengine/user"
 )
 
 const (
@@ -183,7 +182,6 @@ var featuredFiles = []Feature{
 type listTemplateData struct {
 	Featured                  []Feature
 	Stable, Unstable, Archive []Release
-	LoginURL                  string
 }
 
 var (
@@ -218,11 +216,6 @@ func listHandler(w http.ResponseWriter, r *http.Request) {
 			d.Featured = filesToFeatured(d.Stable[0].Files)
 		}
 
-		d.LoginURL, _ = user.LoginURL(c, "/dl")
-		if user.Current(c) != nil {
-			d.LoginURL, _ = user.LogoutURL(c, "/dl")
-		}
-
 		item := &memcache.Item{Key: cacheKey, Object: &d, Expiration: cacheDuration}
 		if err := memcache.Gob.Set(c, item); err != nil {
 			log.Errorf(c, "cache set error: %v", err)

godoc/dl/tmpl.go

@@ -146,13 +146,6 @@ information about Go releases.
 </div>
 {{end}}
 
-
-<!-- Disabled for now; there's no admin functionality yet.
-<p>
-<small><a href="{{.LoginURL}}">&pi;</a></small>
-</p>
--->
-
 <div id="footer">
         <p>
         Except as