[Service Manager] Get rid of dynamic service discovery

mash/example/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//services/catalog/public/tools/catalog.gni")
 import("//testing/test.gni")
 
 group("example") {
   testonly = true
 
   deps = [
     "//mash/example/views_examples",
     "//mash/example/window_type_launcher",
     "//mash/runner",
     "//mash/simple_wm",
   ]
 
   if (is_chromeos) {
     deps += [ "//ash/mus" ]
   }
 }
 
 catalog("catalog") {
   standalone_services = [
-    "simple_wm",
-    "views_examples",
-    "window_type_launcher",
-  ]
-
-  deps = [
     "//mash/example/views_examples:manifest",
     "//mash/example/window_type_launcher:manifest",
     "//mash/simple_wm:manifest",
   ]
 }