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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

Review URL: https://chromiumcodereview.appspot.com/17155020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208010 0039d316-1c4b-4281-b951-d872f2087c98