HTMLTreeBuilder should ASSERT that it is on the main thread before touching elements
Created attachment 181364 [details] Patch
Comment on attachment 181364 [details] Patch OK.
Comment on attachment 181364 [details] Patch Clearing flags on attachment: 181364 Committed r138855: <http://trac.webkit.org/changeset/138855>
All reviewed patches have been landed. Closing bug.