spec: intermittent failure - browser alert

Change-Id: I25d5c111b7beb05d5fc26500f7aeb2dad891a8d2
Reviewed-on: https://gerrit.instructure.com/27855
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Hannah Bottalla <hannah@instructure.com>
Product-Review: Hannah Bottalla <hannah@instructure.com>
QA-Review: Hannah Bottalla <hannah@instructure.com>
Tested-by: Hannah Bottalla <hannah@instructure.com>