cmd/godoc: delete unused autocert hooks

The autocert.go file in x/tools was deleted in CL 162400, but some
related variables were left behind. This change deletes them, since
they are unused by now. (If you're feeling déjà vu, it's likely
because this was done in x/website in CL 197957.)

Updates golang/go#29206
Updates golang/go#32011

Change-Id: I070f711e8bbc7b54f1d169571356fdc24bc00137
Reviewed-on: https://go-review.googlesource.com/c/tools/+/208259
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

cmd/godoc/main.go

@@ -159,10 +159,6 @@ func main() {
 	flag.Usage = usage
 	flag.Parse()
 
-	if certInit != nil {
-		certInit()
-	}
-
 	// Check usage.
 	if flag.NArg() > 0 {
 		fmt.Fprintln(os.Stderr, `Unexpected arguments. Use "go doc" for command-line help output instead. For example, "go doc fmt.Printf".`)
@@ -361,21 +357,10 @@ func main() {
 		go analysis.Run(pointerAnalysis, &corpus.Analysis)
 	}
 
-	if runHTTPS != nil {
-		go func() {
-			if err := runHTTPS(handler); err != nil {
-				log.Fatalf("ListenAndServe TLS: %v", err)
-			}
-		}()
-	}
-
 	// Start http server.
 	if *verbose {
 		log.Println("starting HTTP server")
 	}
-	if wrapHTTPMux != nil {
-		handler = wrapHTTPMux(handler)
-	}
 	if err := http.ListenAndServe(*httpAddr, handler); err != nil {
 		log.Fatalf("ListenAndServe %s: %v", *httpAddr, err)
 	}
@@ -523,11 +508,3 @@ func (moduleFS) RootType(path string) vfs.RootType {
 	}
 }
 func (fs moduleFS) String() string { return "module(" + fs.FileSystem.String() + ")" }
-
-// Hooks that are set non-nil in autocert.go if the "autocert" build tag
-// is used.
-var (
-	certInit    func()
-	runHTTPS    func(http.Handler) error
-	wrapHTTPMux func(http.Handler) http.Handler
-)