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Upstream WPT is now Python 3-first. To minimize the likelihood of
Chromium engineers writing incompatible tests*, we should run the WPT
parts of blinkpy under Python 3.

* Or, more likely, incompatible Python file handlers
(https://web-platform-tests.org/writing-tests/python-handlers/index.html)

Bug: 1135554
Change-Id: I9813a81543219ede80bb58de971d2e4509ef4b53
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2558741
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835668}