Move mojo\shell to services\shell

components/filesystem/public/cpp/prefs/BUILD.gn

 # Copyright 2016 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.
 
 source_set("prefs") {
   sources = [
     "filesystem_json_pref_store.cc",
     "filesystem_json_pref_store.h",
     "pref_service_factory.cc",
     "pref_service_factory.h",
   ]
 
   deps = [
     "//base",
     "//components/filesystem/public/interfaces",
     "//components/prefs",
     "//mojo/common",
-    "//mojo/shell/public/cpp",
+    "//services/shell/public/cpp",
   ]
 
   data_deps = [
     "//components/filesystem",
   ]
 }