Revert of Service Manager: Implement graceful service termination

services/service_manager/public/interfaces/service_control.mojom

-// 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.
-
-module service_manager.mojom;
-
-// The client interface a Service uses to issue requests to the Service Manager.
-interface ServiceControl {
-  // Informs the Service Manager that the Service is ready to terminate. If
-  // the Service Manager needs the Service to stay alive - for example, if
-  // there's an in-flight OnConnect request which hasn't been acked yet - this
-  // request is ignored. Otherwise the Service pipe will soon be severed by
-  // the Service Manager, signaling that shutdown may proceed at the service's
-  // own discretion.
-  RequestQuit();
-};