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Use the vendored copy of the `six` library to make this code work across
Python versions.

Bug: 942720
Change-Id: I4bdb1032ed8e89e733b929eb13ada54efeb3b019
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229335
Commit-Queue: Chris McDonald <cjmcdonald@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Ben Pastene <bpastene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774934}