Fixes include:
- Using the system python when trying to invoke a python script.
- Don't run the test via swarming on mac since there's no mac VMs
available in chrome-swarming's test pool.
Bug: 961548
Change-Id: Idad126d8b90ea77d772fc239d55f799864127eb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1654268
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#668424}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 26f769b13548ea2a4322b48035b872b359676d2d