GitLab

Because Android's API doesn't let us know when a user has
deleted a shortcut from the home screen, record that the
shortcut still exists whenever the shortcut is launched.
This applies to both regular shortcuts and web app launches.

BUG=460229

Review URL: https://codereview.chromium.org/1129293009

Cr-Commit-Position: refs/heads/master@{#329940}