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This should fix the failure in the builder and allow the script to be
run from any directory.

Bug: 1111056
Change-Id: Ibecfbe763a18bf4fcc5f227d23ce42edee3a2ebf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2369011Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801009}