chromeos: Show deprecated accelerator notifications in mash

ash/common/accelerators/accelerator_controller_delegate.h

 // Copyright 2016 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_COMMON_ACCELERATORS_ACCELERATOR_CONTROLLER_DELEGATE_H_
 #define ASH_COMMON_ACCELERATORS_ACCELERATOR_CONTROLLER_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/accelerators/accelerator_table.h"
 
@@ skipping 16 matching lines @@
   // invoked if HandlesAction() returns true.
   virtual bool CanPerformAction(
       AcceleratorAction action,
       const ui::Accelerator& accelerator,
       const ui::Accelerator& previous_accelerator) = 0;
 
   // Performs the specified action.
   virtual void PerformAction(AcceleratorAction action,
                              const ui::Accelerator& accelerator) = 0;
 
-  // Shows a warning the user is using a deprecated accelerator.
-  virtual void ShowDeprecatedAcceleratorNotification(
-      const char* const notification_id,
-      int message_id,
-      int old_shortcut_id,
-      int new_shortcut_id) = 0;
-
  protected:
   virtual ~AcceleratorControllerDelegate() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_ACCELERATORS_ACCELERATOR_CONTROLLER_DELEGATE_H_