Only gaia logins need to trigger one-click signin.

      BUG=154158
TEST=Make sure that one-click sign in works as before, with regular gaia
accounts and dasher accounts.


Review URL: https://chromiumcodereview.appspot.com/11065021

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@160950 0039d316-1c4b-4281-b951-d872f2087c98