Some member variables have mutable keyword though they don't used by const function.
Created attachment 227910 [details] WIP
Created attachment 227926 [details] Patch
Looks good, but I'm not a reviewer yet.
Comment on attachment 227926 [details] Patch r=me
Comment on attachment 227926 [details] Patch Clearing flags on attachment: 227926 Committed r166350: <http://trac.webkit.org/changeset/166350>
All reviewed patches have been landed. Closing bug.