chromeos: Show deprecated accelerator notifications in mash

ash/common/accelerators/accelerator_controller_delegate.h

Index: ash/common/accelerators/accelerator_controller_delegate.h
diff --git a/ash/common/accelerators/accelerator_controller_delegate.h b/ash/common/accelerators/accelerator_controller_delegate.h
index 291d9fd5c1ca4ae6f9ae7e5d5ba9d0aa4a3b6487..5be7cb336d60825a67edc85b07ba255c6a2ac683 100644
--- a/ash/common/accelerators/accelerator_controller_delegate.h
+++ b/ash/common/accelerators/accelerator_controller_delegate.h
@@ -34,13 +34,6 @@ class ASH_EXPORT AcceleratorControllerDelegate {
   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() {}
 };