It has been added as a stub but later ShareableBitmapCairo.cpp has been introduced with the real implementation for Gtk. Let's remove this file.
Created attachment 118232 [details] Patch
Comment on attachment 118232 [details] Patch Clearing flags on attachment: 118232 Committed r102251: <http://trac.webkit.org/changeset/102251>
All reviewed patches have been landed. Closing bug.