The latter form is deprecated, and can generate extraneous output when
running the tests:

    DeprecationWarning: Please use assertEqual instead.

Bug: 984182, 1007872
Change-Id: Ibac81178e719a739560bbc65e0f6b9eda40b313a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1859995
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>