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This fixes various Python3 incompatibilities and updates the
plist files to the new Python3 APIs.

Bug: 1112471
Change-Id: Ie6239ab4454b39e7e65d02d3a2da4b3a1967a6d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522676
Commit-Queue: Dirk Pranke <dpranke@google.com>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829058}