Rename "managed (mode|user)" to "supervised user" (part 9)

Rename "managed (mode|user)" to "supervised user" (part 9)

Followup to https://codereview.chromium.org/403343002/

This CL renames ChromeOS-specific resource IDs (strings/images)

Still missing:
- The global ENABLE_MANAGED_USERS define

TBRing a bunch of renames.
TBR=oshima@chromium.org (ash and c/b/ui/ash)
TBR=antrim@chromium.org (c/b/chromeos and ui/login)

BUG=385113
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=287534

[Marc Treib, 2014-07-31 08:35:10]

This might be the second to last!
PTAL

[Pam (message me for reviews), 2014-08-04 21:24:37]

lgtm

[Marc Treib, 2014-08-05 08:25:49]

The CQ bit was checked by treib@chromium.org

[commit-bot: I haz the power, 2014-08-05 08:28:03]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/treib@chromium.org/425293002/20001

[commit-bot: I haz the power, 2014-08-05 11:14:38]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_aosp on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_aosp/bu...)
  win_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_rel/...)

[commit-bot: I haz the power, 2014-08-05 13:52:59]

Change committed as 287534