b687f6b23b
Similar to another recent patch, this removes uses of SimpleTest.enableLegacyUnpartitionedStorage for the new BroadcastChannel.unpartitionedTestingChannel. One exception is test_bug458091.html, which I just disable for xorigin. It really doesn't need the xorigin coverage imo. It is testing that sessionStorage uses principals, not just the Document URI. Differential Revision: https://phabricator.services.mozilla.com/D242942