R1:4fd81150bec2

Remove "Updated" view from Differential

Summary:
This landed during my review drama embargo and is a generally good idea but had
some implementation issues.

@elynde reports it has been broken for some time, although it still works on
secure.phabricator.com so I'm guessing it's just taking a zillion years to run
at Facebook. It's up to more than a second for me on secure.phabricator.com:

https://secure.phabricator.com/file/view/PHID-FILE-v4ql4c66u3xnkarmrpm4/

The basic problem is that some of the data…