[Gecko Bug 1503804] [wdspec] Use shared assert_png() method in screenshot tests. #13929
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Depends on D10626
Differential Revision: https://phabricator.services.mozilla.com/D10627
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1503804
gecko-commit: 8ee95012eaf0271baf406be0f0b712198f9e01da
gecko-integration-branch: autoland
gecko-reviewers: ato