Removes example code that isn't correctly wired up

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 89 matching lines @@
     "//ui/message_center",
   ]
 
   public_deps = [
     "//ash",
     "//ash/public/cpp",
     "//ash/public/interfaces",
     "//base",
     "//base:i18n",
     "//mash/public/interfaces",
-    "//mash/session/public/interfaces",
     "//mojo/common:common_base",
     "//services/service_manager/public/cpp",
     "//services/tracing/public/cpp",
     "//services/ui/common:mus_common",
     "//services/ui/public/cpp",
     "//services/ui/public/interfaces",
     "//services/ui/public/interfaces/display",
     "//skia",
     "//ui/aura",
     "//ui/events",
@@ skipping 140 matching lines @@
     "//ui/views/mus",
   ]
 
   data_deps = [
     ":mus",
     "//mash/quick_launch",
   ]
 
   defines = [ "NOTIMPLEMENTED_POLICY=5" ]
 }