Currently, testapi.exe is not built when building WinCairo release.
Created attachment 237348 [details] Patch
It looks like these changes were small mistakes in http://trac.webkit.org/changeset/173018
Thanks for reviewing :)
Comment on attachment 237348 [details] Patch Clearing flags on attachment: 237348 Committed r173171: <http://trac.webkit.org/changeset/173171>
All reviewed patches have been landed. Closing bug.