Desktop user manager: Adjustments for supervised users.
The changes are:
- Show a supervised user icon. Note that this has a different look than on CrOS, to fit in with the "lock" icon on desktop. (The final icon resource is still missing, but since this must land in time for M37 I'm already sending the code for review now, and will switch out the icon later.)
- Use the supervised user deletion warning text from CrOS also for supervised users on desktop.
Mocks at https://folio.googleplex.com/chrome-ux/mocks/064-chrome-away-from-chrome/supervised/mirror
BUG=372812, 310640
Review URL: https://codereview.chromium.org/
307483002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274215 0039d316-1c4b-4281-b951-d872f2087c98