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This is the simpler version of actually making sure that even if it
skipped it will not allow forced reenrollment to be circumvented.

This option will be reintroduced in the first stable version to contain
all other safeguards in place.

BUG=378953

Review URL: https://codereview.chromium.org/306993004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273875 0039d316-1c4b-4281-b951-d872f2087c98