A few elements of the revamped project structure for WebKit2 were not quite right for the WinCairo build. This bug corrects these issues.
Created attachment 61580 [details] Fixes to build under WinCairo.
Not an official review (that'll be aroben or sfalken), but this looked good on my inspection.
Landed in http://trac.webkit.org/changeset/63438.