See: http://build.webkit.org/results/Lion%20Intel%20Debug%20%28WebKit2%20Tests%29/r111292%20%285066%29/http/tests/websocket/tests/hixie76/frame-lengths-pretty-diff.html It times out locally, too, but it's fine on WK1.
<rdar://problem/11079119>
Skipped in http://trac.webkit.org/changeset/111337
It's just a slow test, and might be actually working correctly. Note that this specific test will likely be removed soon with the rest of hixie76 support, but there is also http/tests/websocket/tests/hybi/frame-lengths.html, which likely has the same issue.
This test no longer exists.