function commonVerify(db, verify) {
  return goog.Promise.all([
    lf.backstore.FirebaseRawBackStore.getValue(db.getRef(), '1'),
    lf.backstore.FirebaseRawBackStore.getValue(db.getRef(), '2')
  ]).then(function(results) {
    results.forEach(function(result, index) {
      verify(index, result);
    });
  });
}
@param {!lf.backstore.Firebase} db
@param {!function(number, !Object)} verify
@return {!IThenable}