Make HTTP middleware easier to use

appengine/gaemiddleware/routes.go

Index: appengine/gaemiddleware/routes.go
diff --git a/appengine/gaemiddleware/routes.go b/appengine/gaemiddleware/routes.go
index e52cf252dff223198b99c65d8219e718aa4b9a4f..62b53b75379cf08a05a7e4783112af188bc3fbcf 100644
--- a/appengine/gaemiddleware/routes.go
+++ b/appengine/gaemiddleware/routes.go
@@ -5,8 +5,7 @@
 package gaemiddleware
 
 import (
-	"github.com/julienschmidt/httprouter"
-	"github.com/luci/luci-go/server/middleware"
+	"github.com/luci/luci-go/server/router"
 	"github.com/luci/luci-go/server/settings/admin"
 
 	gaeauth "github.com/luci/luci-go/appengine/gaeauth/server"
@@ -19,8 +18,8 @@ import (
 // work (e.g. authentication related routes, time series monitoring, etc).
 //
 // 'base' is expected to be BaseProd or its derivative.
-func InstallHandlers(r *httprouter.Router, base middleware.Base) {
-	gaeauth.InstallWebHandlers(r, base)
-	tsmon.InstallHandlers(r, base)
-	admin.InstallHandlers(r, base, &gaeauth.UsersAPIAuthMethod{})
+func InstallHandlers(r *router.Router, handlers []router.Handler) {
+	gaeauth.InstallWebHandlers(r, handlers)
+	tsmon.InstallHandlers(r, handlers)
+	admin.InstallHandlers(r, handlers, &gaeauth.UsersAPIAuthMethod{})
 }