Revert "Post a silent notification if screenshot is dismissed"

This reverts commit c0841cf1020bd03ea5fd97daf4a3092e6d90f028.

Reason for revert: We no longer want to post a notification, due
to concerns about UI consistency.

Bug: 158854375
Fix: 158854375
Test: manual

Change-Id: Icb01a9afe7118580082c31f993265e243c9a5db7
2 files changed