After r234652, [NSScroller preferredScrollerStyle] is called in the UI process, and we need to set the same user defaults related to scrollbars in the UI process as we do in the WebProcess.
Created attachment 346860 [details] Patch
Comment on attachment 346860 [details] Patch This has been requesting review for more than one year. If this is still needed, please rebase and re-request review.
<rdar://problem/84894823>