Now that the crossplatform and mac specific undo/redo support has been added to WebKit2, we need to add the necessary glue to make it work on windows.
<rdar://problem/8449521>
See also bug 55962, WebKit2: Expose WebEditCommandProxy in the C API on Windows
Created attachment 85114 [details] Patch
Committed r80609: <http://trac.webkit.org/changeset/80609>