This reverts commit 63896cc8.

It's no longer necessary to update these URLs, because
commit 0de9fa76 makes the old-style URLs redirect to the
new-style URLs. And since this rewrite will be a lengthy
operation on large sites, and could potentially cause
problems with URLs for other domain names that happen to
contain "view/artefact.php", we should just remove this
upgrade section.

Change-Id: Ic981f739d6ac5e76efe8116531fc365947ebf286