WM_PRINT doesn't work with the new drawing area, and causes an asertion failure in DrawingAreaProxyImpl::paint(const WebCore::IntRect&, PlatformDrawingContext) in Debug builds. The assertion is an ASSERT_NOT_REACHED().
<rdar://problem/8979559>
Created attachment 81876 [details] Hook up WM_PRINT to the new drawing area
Committed r78200: <http://trac.webkit.org/changeset/78200>