Remove released do_not_delay_chooser_adapter_notify_data_change flag.

As a result, unused ChooserListAdapter#notifyDataSetChanged override
and ChooserActiivty#sendListViewUpdateMessage are aslo removed.

Bug: 429722659
Test: presubmits
Flag: EXEMPT removing android.service.chooser.do_not_delay_chooser_adapter_notify_data_change
Change-Id: Ie863f1adcedfd419c3ede811a4417a82b7c5a930