GitLab

MultiUserNotificationBlockerChromeOS now supports visiting windows.
Due to the dependency from MultiUserWindowManagerChromeOS, it would
be beter to be in c/b/ui/ash/multi_user rather than notification.

Because now this blocker is turned on only when multi-user feature
is enabled, the test for single-user mode has been removed.

BUG=321679
R=dewittj@chromium.org, skuhne@chromium.org, sky@chromium.org
TBR=bshe@chromium.org
TEST=unit_tests / manually

Review URL: https://codereview.chromium.org/127423002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244058 0039d316-1c4b-4281-b951-d872f2087c98