Make HTTP middleware easier to use

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

Index: common/prpc/talk/buildbot/frontend/handler.go
diff --git a/common/prpc/talk/buildbot/frontend/handler.go b/common/prpc/talk/buildbot/frontend/handler.go
index cf4b22b55497285ddbd81cea365de4252cf007f9..d1d4a61c25ce249a628e85420d999582c0637c57 100644
--- a/common/prpc/talk/buildbot/frontend/handler.go
+++ b/common/prpc/talk/buildbot/frontend/handler.go
@@ -7,16 +7,15 @@ 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)
+	router := router.New()
+	gaemiddleware.InstallHandlers(router, gaemiddleware.BaseProd())
 
-	InstallAPIRoutes(router, gaemiddleware.BaseProd)
+	InstallAPIRoutes(router, gaemiddleware.BaseProd())
 
 	http.DefaultServeMux.Handle("/", router)
 }