Move //mojo/services/X/public/... to //mojo/services/X/... (part 3).

examples/notification_generator/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("//mojo/public/mojo_application.gni")
 
 mojo_native_application("notification_generator") {
   sources = [
     "notification_generator.cc",
   ]
 
   deps = [
     "//base",
     "//mojo/application",
     "//mojo/common",
     "//mojo/public/interfaces/application:application__generator",
-    "//mojo/services/notifications/public/interfaces",
+    "//mojo/services/notifications/interfaces",
   ]
 }