Modernize Differential SearchEngine just enough to get NUX
Summary: Ref T10032. This is sufficent to hit NUX without doing anything bad.
Test Plan:
- Visited NUX.
- Browsed normally.
{F1043191}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T10032
Differential Revision: https://secure.phabricator.com/D14876