Make HTTP middleware easier to use

common/prpc/talk/buildbot/frontend/handler.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package buildbot
 
 import (
         "net/http"
 
-        "github.com/julienschmidt/httprouter"
-
         "github.com/luci/luci-go/appengine/gaemiddleware"
+        "github.com/luci/luci-go/server/router"
 )
 
 func init() {
-        router := httprouter.New()
-        gaemiddleware.InstallHandlers(router, gaemiddleware.BaseProd)
+        r := router.New()
+        basemw := gaemiddleware.BaseProd()
 
-        InstallAPIRoutes(router, gaemiddleware.BaseProd)
-
-        http.DefaultServeMux.Handle("/", router)
+        gaemiddleware.InstallHandlers(r, basemw)
+        InstallAPIRoutes(r, basemw)
+        http.DefaultServeMux.Handle("/", r)
 }