Remove mojo network service.

mojo/services/network/network_service_delegate_observer.h

-// 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.
-
-#ifndef MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_OBSERVER_H_
-#define MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_OBSERVER_H_
-
-namespace mojo {
-
-// Observer of events on from the NetworkServiceDelegate.
-//
-// Observers should be registered on the main thread.
-class NetworkServiceDelegateObserver {
- public:
-  ~NetworkServiceDelegateObserver() {}
-
-  // Broadcast right before we attempt to shutdown the IO worker thread. This
-  // is
-  virtual void OnIOWorkerThreadShutdown() = 0;
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_SERVICES_NETWORK_NETWORK_SERVICE_DELEGATE_OBSERVER_H_