[cros, sync] On Chrome OS user 'display email' for user visible sync status since it preserves dots in email.

BUG=340251
R=atwilson@chromium.org, rogerta@chromium.org

Review URL: https://codereview.chromium.org/151693005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249342 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249342