By Bug 89409, we started to store unmodified form control state. However we don't need to make such state for some types. For example, we don't need to save state of type=password controls at all.
Created attachment 151676 [details] Patch
Comment on attachment 151676 [details] Patch Clearing flags on attachment: 151676 Committed r122414: <http://trac.webkit.org/changeset/122414>
All reviewed patches have been landed. Closing bug.