Differential Revision: https://phabricator.services.mozilla.com/D25546 --HG-- rename : layout/reftests/css-display/display-contents-shadow-dom-1-ref.html => testing/web-platform/tests/css/css-display/display-contents-shadow-dom-1-ref.html extra : rebase_source : 93b017a3750bcdb2c0e4f592a3fd598f3e9fe698