Removes example code that isn't correctly wired up

mash/screenlock/screenlock.h

-// 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.
-
-#ifndef MASH_SCREENLOCK_SCREENLOCK_H_
-#define MASH_SCREENLOCK_SCREENLOCK_H_
-
-#include <map>
-#include <memory>
-
-#include "base/macros.h"
-#include "mash/session/public/interfaces/session.mojom.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-#include "services/service_manager/public/cpp/service.h"
-#include "services/tracing/public/cpp/provider.h"
-
-namespace views {
-class AuraInit;
-class WindowManagerConnection;
-}
-
-namespace mash {
-namespace screenlock {
-
-class Screenlock : public service_manager::Service,
-                   public session::mojom::ScreenlockStateListener {
- public:
-  Screenlock();
-  ~Screenlock() override;
-
- private:
-  // service_manager::Service:
-  void OnStart() override;
-  bool OnConnect(const service_manager::ServiceInfo& remote_info,
-                 service_manager::InterfaceRegistry* registry) override;
-
-  // session::mojom::ScreenlockStateListener:
-  void ScreenlockStateChanged(bool locked) override;
-
-  tracing::Provider tracing_;
-  std::unique_ptr<views::AuraInit> aura_init_;
-  std::unique_ptr<views::WindowManagerConnection> window_manager_connection_;
-  mojo::BindingSet<session::mojom::ScreenlockStateListener> bindings_;
-
-  DISALLOW_COPY_AND_ASSIGN(Screenlock);
-};
-
-}  // namespace screenlock
-}  // namespace mash
-
-#endif  // MASH_SCREENLOCK_SCREENLOCK_H_