Fixed <rdar://problem/3985579> 8A367: Dashboard: Stock widget not visible when click...

	Fixed <rdar://problem/3985579> 8A367: Dashboard: Stock widget not visible when click remove to remove single char ticker symbol

	Explicitly remove scroll bar views when removing them from
	the overflow.

	Don't paint synchronously when the scroll position changes,
	this caused funky clip problems.

        Reviewed by Hyatt.

        * khtml/rendering/render_layer.cpp:
        (RenderLayer::scrollToOffset):
        (RenderLayer::setHasHorizontalScrollbar):
        (RenderLayer::setHasVerticalScrollbar):
        (RenderLayer::updateScrollInfoAfterLayout):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@8676 268f45cc-cd09-0410-ab3c-d52691b4dbfc