Delete LoFi tests

We won't be needing these again.

Bug: 959983
Change-Id: I1f3f159a6c5a5dad28fa72dcf4590328440aa030
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599409
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Auto-Submit: Robert Ogden <robertogden@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657310}