No one uses the method. FIXME is saying:
// FIXME: We can remove this function once V8 showModalDialog is changed to use DOMWindow.
Given that V8's showModalDialog is now using DOMWindow, we can remove it.
Created attachment 186999 [details]
Comment on attachment 186999 [details]
Committed r142075: <http://trac.webkit.org/changeset/142075>