Remove unused AppKeepAliveService

apps/app_keep_alive_service_factory.h

-// Copyright 2013 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 APPS_APP_KEEP_ALIVE_SERVICE_FACTORY_H_
-#define APPS_APP_KEEP_ALIVE_SERVICE_FACTORY_H_
-
-#include "base/memory/singleton.h"
-#include "components/browser_context_keyed_service/browser_context_keyed_service_factory.h"
-
-namespace apps {
-
-class AppKeepAliveService;
-
-class AppKeepAliveServiceFactory : public BrowserContextKeyedServiceFactory {
- public:
-  static AppKeepAliveServiceFactory* GetInstance();
-
- private:
-  friend struct DefaultSingletonTraits<AppKeepAliveServiceFactory>;
-
-  AppKeepAliveServiceFactory();
-  virtual ~AppKeepAliveServiceFactory();
-
-  // BrowserContextKeyedServiceFactory:
-  virtual BrowserContextKeyedService* BuildServiceInstanceFor(
-      content::BrowserContext* context) const OVERRIDE;
-  virtual bool ServiceIsCreatedWithBrowserContext() const OVERRIDE;
-  virtual content::BrowserContext* GetBrowserContextToUse(
-      content::BrowserContext* context) const OVERRIDE;
-  virtual bool ServiceIsNULLWhileTesting() const OVERRIDE;
-};
-
-}  // namespace apps
-
-#endif  // APPS_APP_KEEP_ALIVE_SERVICE_FACTORY_H_