Move Mus into chrome's process when running with --mus.

chrome/app/BUILD.gn

 # Copyright 2014 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("//chrome/common/features.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
 import("//services/catalog/public/tools/catalog.gni")
 import("//services/service_manager/public/service_manifest.gni")
@@ skipping 390 matching lines @@
   source =
       "//chrome/browser/chrome_content_packaged_services_manifest_overlay.json"
   packaged_services = chrome_packaged_services
 }
 
 service_manifest("chrome_content_packaged_services_manifest_overlay") {
   source =
       "//chrome/browser/chrome_content_packaged_services_manifest_overlay.json"
   packaged_services = chrome_packaged_services
   if (is_chromeos) {
-    packaged_services += [ "//ash/mus:manifest" ]
+    packaged_services += [
+      "//ash/mus:manifest",
+      "//services/ui:manifest",
+    ]
   }
 }
 
 service_manifest("chrome_content_browser_manifest_overlay") {
   source = "//chrome/browser/chrome_content_browser_manifest_overlay.json"
   packaged_services = [
     "//services/identity:manifest",
     "//services/preferences:manifest",
   ]
 }
@@ skipping 114 matching lines @@
   }
 
   catalog("catalog_for_tests_mash") {
     embedded_services = chrome_embedded_services + [
                           ":chrome_content_packaged_services_manifest_for_mash",
                           ":chrome_test_browser_manifest",
                         ]
     embedded_services -= [ ":chrome_content_browser_manifest" ]
   }
 }