Fix some timing and display issues with the supervised-user confirmation.

Fix some timing and display issues with the supervised-user confirmation.

Collect the custodian's signed-in status each time the confirmation
dialog is shown, to catch changes in status that happen after the
Settings page loads.

Also HTML-escape the new profile's name (and the custodian's email,
for good measure), so the confirmation-dialog string can be HTML rather
than text and the link to the management page can be active.

BUG=252860, 252691
TEST=manual

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=208010

[Pam (message me for reviews), 2013-06-21 20:57:11]

Please review.

Note that this depends on the changes from the big string CL
(https://codereview.chromium.org/17320005/, in the CQ).

I'll wait for the string-change CL to land before this one.

Thanks,
- Pam

[Sergiu, 2013-06-21 21:54:08]

lgtm

[commit-bot: I haz the power, 2013-06-22 00:14:13]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pam@chromium.org/17155020/5002

[commit-bot: I haz the power, 2013-06-22 02:35:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pam@chromium.org/17155020/5002

[commit-bot: I haz the power, 2013-06-22 03:03:37]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pam@chromium.org/17155020/5002

[commit-bot: I haz the power, 2013-06-22 04:43:04]

Retried try job too often on mac_rel for step(s) base_unittests, browser_tests,
cacheinvalidation_unittests, cc_unittests, check_deps, chromedriver2_unittests,
components_unittests, content_browsertests, content_unittests, crypto_unittests,
gpu_unittests, interactive_ui_tests, ipc_tests, jingle_unittests,
media_unittests, nacl_integration, net_unittests, ppapi_unittests,
printing_unittests, remoting_unittests, sql_unittests, sync_integration_tests,
sync_unit_tests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=mac_rel&nu...

[commit-bot: I haz the power, 2013-06-22 04:43:56]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pam@chromium.org/17155020/5002

[commit-bot: I haz the power, 2013-06-22 06:57:06]

Change committed as 208010