GitLab

app_host.exe was removed in r220555. This change removes some dead code
that was left behind. Specifically:
- chrome_launcher_support no longer exposes any methods related to the
  AppHost.
- Chrome's uninstall prompt no longer has a special case to handle
  suppressing the "delete your profile" checkbox.
- Chrome and its installer no longer have a dependency on
  launcher_support.
- The installer no longer supports installing items from the webstore.
- GetUntrustedDataValue no longer has consumers and is gone.

BUG=297647
R=benwells@chromium.org,huangs@chromium.org,gab@chromium.org
TBR=grt@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/419913005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285715 0039d316-1c4b-4281-b951-d872f2087c98