GitLab

Clean up code that has become obsolete due to decomission of
ChromeDriver waterfall.

Change-Id: Ifbdb43872111ec3e575ec6e4aa1b28b76b663756
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1509095
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638687}