The DRT currently wraps the WebKitWebView in a GtkScrolledWindow, which causes a good deal of flakiness during testing. GtkScrolledWindow operates asynchronously, while many tests are written with the assumption that scrolling is synchronous. By using WebCore-only scrollbars on the bots we can avoid these spurious failures.
I should also mention that this will allow us to share more results between WebKit1 and WebKit2.
Created attachment 96345 [details]
Comment on attachment 96345 [details]
Looks correct to me.
Committed r91707: <http://trac.webkit.org/changeset/91707>