Unskip js/script-tests/class-syntax-scoping.js. It claims it was skipped because class syntax was not enabled by default. It now is enabled, and appears to be working correctly.
Created attachment 280667 [details] [PATCH] Proposed Fix
Comment on attachment 280667 [details] [PATCH] Proposed Fix Clearing flags on attachment: 280667 Committed r201746: <http://trac.webkit.org/changeset/201746>
All reviewed patches have been landed. Closing bug.