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The script had a couple of issues that crop up with
Python3's str/bytes/unicode changes.

Bug: 1168342
Change-Id: Ic1ff68d099245bcf5b39382bc5f3919fd13609a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638785Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@google.com>
Cr-Commit-Position: refs/heads/master@{#845408}