After bug 101192 changed the WebKit-Chromium API and http://code.google.com/p/chromium/issues/detail?id=164162 changed Chromium so it doesn't call setExperimentalCSSRegionsEnabled, we can now remove this deprecated API.
Created attachment 184203 [details] patch
Please wait for approval from abarth@webkit.org, dglazkov@chromium.org, fishd@chromium.org, jamesr@chromium.org or tkent@chromium.org before submitting, as this patch contains changes to the Chromium public API. See also https://trac.webkit.org/wiki/ChromiumWebKitAPI.
Comment on attachment 184203 [details] patch LGTM (assuming all callers are gone)
Comment on attachment 184203 [details] patch Clearing flags on attachment: 184203 Committed r140663: <http://trac.webkit.org/changeset/140663>
All reviewed patches have been landed. Closing bug.