GitLab

NOTIFICATION_TYPE_SIMPLE has been removed from rich notifications.  So, we
should no longer rely on that constant.  While I am at it, I also cleaned
up a comment, and removed a reference to a unit test that we ended up not
using.

BUG=243959

Review URL: https://chromiumcodereview.appspot.com/16159002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203871 0039d316-1c4b-4281-b951-d872f2087c98