Currently WebSettings does not have an interface to change unifiedTextCheckerEnabled flag.
Created attachment 116070 [details] Patch
Please wait for approval from fishd@chromium.org before submitting because this patch contains changes to the Chromium public API.
Comment on attachment 116070 [details] Patch Clearing flags on attachment: 116070 Committed r100927: <http://trac.webkit.org/changeset/100927>
All reviewed patches have been landed. Closing bug.