Revert of Introduce the devices Mojo app

device/devices_app/devices_app.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 DEVICE_DEVICES_DEVICES_APP_H_
-#define DEVICE_DEVICES_DEVICES_APP_H_
-
-#include "base/cancelable_callback.h"
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "mojo/application/public/cpp/application_delegate.h"
-#include "mojo/application/public/cpp/interface_factory.h"
-#include "third_party/mojo/src/mojo/public/cpp/bindings/error_handler.h"
-
-namespace base {
-class SequencedTaskRunner;
-}
-
-namespace mojo {
-class ApplicationImpl;
-}
-
-namespace device {
-
-namespace usb {
-class DeviceManager;
-}
-
-extern const char kDevicesMojoAppUrl[];
-
-class DevicesApp : public mojo::ApplicationDelegate,
-                   public mojo::InterfaceFactory<usb::DeviceManager>,
-                   public mojo::ErrorHandler {
- public:
-  ~DevicesApp() override;
-
-  // |service_task_runner| is the thread TaskRunner on which the UsbService
-  // lives. This argument should be removed once UsbService is owned by the
-  // USB device manager and no longer part of the public device API. If null,
-  // the app will construct its own DeviceClient and UsbService.
-  static scoped_ptr<mojo::ApplicationDelegate> CreateDelegate(
-      scoped_refptr<base::SequencedTaskRunner> service_task_runner);
-
- private:
-  class USBServiceInitializer;
-
-  DevicesApp(scoped_refptr<base::SequencedTaskRunner> service_task_runner);
-
-  // mojo::ApplicationDelegate:
-  void Initialize(mojo::ApplicationImpl* app) override;
-  bool ConfigureIncomingConnection(
-      mojo::ApplicationConnection* connection) override;
-  void Quit() override;
-
-  // mojo::InterfaceFactory<usb::DeviceManager>:
-  void Create(mojo::ApplicationConnection* connection,
-              mojo::InterfaceRequest<usb::DeviceManager> request) override;
-
-  // mojo::ErrorHandler:
-  void OnConnectionError() override;
-
-  // Sets the app for destruction after a period of idle time. If any top-level
-  // services (e.g. usb::DeviceManager) are bound before the timeout elapses,
-  // it's canceled.
-  void StartIdleTimer();
-
-  mojo::ApplicationImpl* app_impl_;
-  scoped_ptr<USBServiceInitializer> service_initializer_;
-  scoped_refptr<base::SequencedTaskRunner> service_task_runner_;
-  size_t active_device_manager_count_;
-
-  // Callback used to shut down the app after a period of inactivity.
-  base::CancelableClosure idle_timeout_callback_;
-
-  DISALLOW_COPY_AND_ASSIGN(DevicesApp);
-};
-
-}  // naespace device
-
-#endif  // DEVICE_DEVICES_DEVICES_APP_H_