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If switched on via a command line flag, the new version of the
enrollment screen is enabled. It uses the authentication extension,
which will fetch an OAuth token that is then used to register for device
policy.

BUG=chromium-os:18203
TEST=Enable flags and test enrollment.

Review URL: http://codereview.chromium.org/7562008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@96181 0039d316-1c4b-4281-b951-d872f2087c98