Vertically centering the user name for guest mode.

BUG=181079
TEST=visual

Review URL: https://chromiumcodereview.appspot.com/15738017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@201934 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed