Revert of Introduce ash mojo interface for lock screen action handlers

chrome/browser/chromeos/lock_screen_apps/state_observer.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 CHROME_BROWSER_CHROMEOS_LOCK_SCREEN_APPS_STATE_OBSERVER_H_
 #define CHROME_BROWSER_CHROMEOS_LOCK_SCREEN_APPS_STATE_OBSERVER_H_
 
-#include "ash/public/interfaces/tray_action.mojom.h"
+#include "chrome/browser/chromeos/lock_screen_apps/types.h"
 
 namespace lock_screen_apps {
 
 // Interface that can be used to observe lock screen apps state.
 class StateObserver {
  public:
   virtual ~StateObserver() {}
 
   // Invoked when the state of support for app provided lock screen actions
   // changes.
-  virtual void OnLockScreenNoteStateChanged(
-      ash::mojom::TrayActionState state) = 0;
+  // |states|: Maps actions supported by the platform to their current state.
+  virtual void OnLockScreenAppsStateChanged(Action action,
+                                            ActionState state) = 0;
 };
 
 }  // namespace lock_screen_apps
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOCK_SCREEN_APPS_STATE_OBSERVER_H_