Revert of Introduce ash mojo interface for lock screen action handlers

ash/tray_action/tray_action.h

-// Copyright 2017 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 ASH_TRAY_ACTION_TRAY_ACTION_H_
-#define ASH_TRAY_ACTION_TRAY_ACTION_H_
-
-#include "ash/public/interfaces/tray_action.mojom.h"
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
-
-namespace ash {
-
-class TrayActionObserver;
-
-// Controller that ash can use to request a predefined set of actions to be
-// performed by clients.
-// The controller provides an interface to:
-//  * Send a request to the client to handle an action.
-//  * Observe the state of support for an action as reported by the current ash
-//    client.
-// Currently, only single action is supported - creating new note on the lock
-// screen - Chrome handles this action by launching an app (if any) that is
-// registered as a lock screen enabled action handler for the new note action.
-class TrayAction : public mojom::TrayAction {
- public:
-  TrayAction();
-  ~TrayAction() override;
-
-  void AddObserver(TrayActionObserver* observer);
-  void RemoveObserver(TrayActionObserver* observer);
-
-  void BindRequest(mojom::TrayActionRequest request);
-
-  // Gets last known handler state for the lock screen note action.
-  // It will return kNotAvailable if an action handler has not been set using
-  // |SetClient|.
-  mojom::TrayActionState GetLockScreenNoteState();
-
-  // If the client is set, sends it a request to handle the lock screen note
-  // action.
-  void RequestNewLockScreenNote();
-
-  // mojom::TrayAction:
-  void SetClient(mojom::TrayActionClientPtr action_handler,
-                 mojom::TrayActionState lock_screen_note_state) override;
-  void UpdateLockScreenNoteState(mojom::TrayActionState state) override;
-
- private:
-  // Notifies the observers that state for the lock screen note action has been
-  // updated.
-  void NotifyLockScreenNoteStateChanged();
-
-  // Last known state for lock screen note action.
-  mojom::TrayActionState lock_screen_note_state_ =
-      mojom::TrayActionState::kNotAvailable;
-
-  base::ObserverList<TrayActionObserver> observers_;
-
-  mojo::BindingSet<mojom::TrayAction> bindings_;
-
-  mojom::TrayActionClientPtr tray_action_client_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrayAction);
-};
-
-}  // namespace ash
-
-#endif  // ASH_TRAY_ACTION_TRAY_ACTION_H_