https://bugs.webkit.org/show_bug.cgi?id=47853 appears to have broken window-property-descriptors on some platforms. It appears that the platform-specific expectations files were not changed as a part of that bug.
Created attachment 72234 [details] Patch
I just edited the expectations file manually, but I strongly suspect this will do the trick to fix the broken build. Sorry for missing these in the first place. (Maybe webkit-patch should warn about updating the main expectations file and not the platform-specific ones.) Is there some better way to do this rebaselining? The build error here just said failed (http://build.webkit.org/builders/Qt%20Linux%20Release/builds/22771/steps/layout-test/logs/stdio), and I couldn't find the actual output to use and feel more assured that this would fix the problem.
Comment on attachment 72234 [details] Patch OK.
The commit-queue encountered the following flaky tests while processing attachment 72234 [details]: http/tests/misc/copy-resolves-urls.html Please file bugs against the tests. These tests were authored by tony@chromium.org. The commit-queue is continuing to process your patch.
Comment on attachment 72234 [details] Patch Clearing flags on attachment: 72234 Committed r70818: <http://trac.webkit.org/changeset/70818>
All reviewed patches have been landed. Closing bug.