ash: Remove broken display notification suppression when settings is open

ash/common/system/tray/system_tray_delegate.h

Index: ash/common/system/tray/system_tray_delegate.h
diff --git a/ash/common/system/tray/system_tray_delegate.h b/ash/common/system/tray/system_tray_delegate.h
index 1c9da5a67c862563281067325fe5b2ebed1c6c06..a72e66277a93f5131e8a34f9be29844ab6a5f027 100644
--- a/ash/common/system/tray/system_tray_delegate.h
+++ b/ash/common/system/tray/system_tray_delegate.h
@@ -147,10 +147,6 @@ class ASH_EXPORT SystemTrayDelegate {
   // Shows the dialog to set system time, date, and timezone.
   virtual void ShowSetTimeDialog();
 
-  // Returns true if the notification for the display configuration change
-  // should appear.
-  virtual bool ShouldShowDisplayNotification();
-
   // Shows information about enterprise enrolled devices.
   virtual void ShowEnterpriseInfo();