GitLab

Fix path for downloading older Windows Chrome builds used by
ChromeDriver waterfall.

TBR=crouleau@chromium.org

Change-Id: I936785500de4211a8bdd3e0ce1cdf2fc16e31c8e
Reviewed-on: https://chromium-review.googlesource.com/1227715Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591595}