This seems to be caused by ScriptController::createScriptInstanceForWidget() always returning null.
Created attachment 245159 [details] Patch
This may be fallout from our recent refactoring to move Plugins out of WebCore and into the WebKit library. I've currently got the Plugin tests skipped while I work through the whole set of failures. I will take a look at this soon, but maybe you will get to it sooner! :-)
Comment on attachment 245159 [details] Patch Clearing flags on attachment: 245159 Committed r178968: <http://trac.webkit.org/changeset/178968>
All reviewed patches have been landed. Closing bug.
(In reply to comment #2) > This may be fallout from our recent refactoring to move Plugins out of > WebCore and into the WebKit library. > > I've currently got the Plugin tests skipped while I work through the whole > set of failures. I will take a look at this soon, but maybe you will get to > it sooner! :-) Thanks for reviewing! It's great that you're looking into the tests, I just noticed this during everyday browsing :)