Remove duplicate application cpp files in mojo/application.

mojo/application/app_lifetime_helper.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_APPLICATION_APP_LIFETIME_HELPER_H_
-#define MOJO_APPLICATION_APP_LIFETIME_HELPER_H_
-
-#include "base/basictypes.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/single_thread_task_runner.h"
-
-namespace mojo {
-
-class AppLifetimeHelper;
-
-// A service implementation should keep this object as a member variable to hold
-// a reference on the application.
-// Since services can live on different threads than the app, this class is
-// safe to use on any thread. However, each instance should only be used on one
-// thread at a time (otherwise there'll be races between the addref resulting
-// from cloning and destruction).
-class AppRefCount {
- public:
-  ~AppRefCount();
-
-  // When a service creates another object that is held by the client, it should
-  // also vend to it a refcount using this method. That way if the caller stops
-  // holding on to the service but keeps the reference to the object, the app is
-  // still alive.
-  scoped_ptr<AppRefCount> Clone();
-
- private:
-  friend AppLifetimeHelper;
-
-  AppRefCount(AppLifetimeHelper* app_lifetime_helper,
-              scoped_refptr<base::SingleThreadTaskRunner> app_task_runner);
-
-  // Don't need to use weak ptr because if the app thread is alive that means
-  // app is.
-  AppLifetimeHelper* app_lifetime_helper_;
-  scoped_refptr<base::SingleThreadTaskRunner> app_task_runner_;
-
-#ifndef NDEBUG
-  scoped_refptr<base::SingleThreadTaskRunner> clone_task_runner_;
-#endif
-
-  DISALLOW_COPY_AND_ASSIGN(AppRefCount);
-};
-
-// This is a helper class for apps to manage their lifetime, specifically so
-// apps can quit when they're not used anymore.
-// An app can contain an object of this class as a member variable. Each time it
-// creates an instance of a service, it gives it a refcount using
-// CreateAppRefCount. The service implementation then keeps that object as a
-// member variable. When all the service implemenations go away, the app will be
-// quit with a call to mojo::ApplicationImpl::Terminate().
-class AppLifetimeHelper {
- public:
-  AppLifetimeHelper();
-  ~AppLifetimeHelper();
-
-  scoped_ptr<AppRefCount> CreateAppRefCount();
-
- private:
-  friend AppRefCount;
-  void AddRef();
-  void Release();
-
-  int ref_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(AppLifetimeHelper);
-};
-
-}  // namespace mojo
-
-#endif  // MOJO_APPLICATION_APP_LIFETIME_HELPER_H_