These are passing now, and the result for WebKitGTK+ matches the expectation for the Mac port, so it seems we're good unskipping these two :-)
Created attachment 324698 [details] Patch
Comment on attachment 324698 [details] Patch Clearing flags on attachment: 324698 Committed r223913: <https://trac.webkit.org/changeset/223913>
All reviewed patches have been landed. Closing bug.