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They were causing all commands to fail with:
swarming: googleapi: Error 400: request.env_prefixes[u'PATH'] conflicts with pool's template

Was able to run base_unittests without them, so guessing they are no
longer needed.

Change-Id: If7a1992cb98ac96e056be0565b9d0430e498eb8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2111652Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752048}