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

mojo/services/service_registry/interfaces/service_registry.mojom

 // 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.
 
 [DartPackage="mojo_services"]
 module mojo;
 
 import "mojo/public/interfaces/application/service_provider.mojom";
 
 interface ServiceRegistry {
   AddServices(array<string> interface_names,
               mojo.ServiceProvider service_provider);
 };