Remove 'reload' timeout.

This timeout was designed for a very specific case (hit stop during a
hot code push, come back to the page later and you don't expect your
session state to still be there), but it's not clear what length of time
is right for that, nor whether it's even what users expect (and if there
should be a timeout, it probably varies from package to package
depending on what type of data the package is storing in sessionStorage
-- e.g. for OAuth logins, 30 seconds is way too short of a timeout).

Fixes #2696.