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Ran "2to3 -w -n -f print ./base" and manually added imports.
There are no intended behaviour changes.

Bug: 941669
Change-Id: Ie2830e213eae3a5d7753ce503020e02811b726d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1585890
Commit-Queue: Raul Tambre <raul@tambre.ee>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Auto-Submit: Raul Tambre <raul@tambre.ee>
Cr-Commit-Position: refs/heads/master@{#658917}