This seems to no longer be necessary, as relative paths 'just work' for
CIPD deps now.

Change-Id: I3843548dc74d29af90e0c402f0459dbe60934423
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1529132Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>