Revert of [Service Manager] Get rid of dynamic service discovery

ash/mus/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("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//services/service_manager/public/cpp/service.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//tools/grit/repack.gni")
 
@@ skipping 122 matching lines @@
     ":lib",
     ":resources",
     ":resources_200",
     "//services/service_manager/public/cpp",
   ]
 
   # TODO(beng): This target relies on //mash/session, but there is a cycle so we
   #             can't state that dependency here.
   data_deps = [
     ":manifest",
-    ":resources",
-    ":resources_200",
     "//services/ui",
   ]
+
+  resources = [
+    "$root_out_dir/ash_mus_resources.pak",
+    "$root_out_dir/ash_mus_resources_200.pak",
+  ]
 }
 
 service_manifest("manifest") {
   name = "ash"
   source = "manifest.json"
 }
 
 # TODO: Load locale-specific strings.
 # TODO: Avoid duplication between Mash and Chrome pak files: crbug.com/628715.
 repack("resources") {
@@ skipping 88 matching lines @@
     "//ui/views/mus",
   ]
 
   data_deps = [
     ":mus",
     "//mash/quick_launch",
   ]
 
   defines = [ "NOTIMPLEMENTED_POLICY=5" ]
 }