Unreviewed, rolling out r96070 and r96075.

Unreviewed, rolling out r96070 and r96075.
http://trac.webkit.org/changeset/96070
http://trac.webkit.org/changeset/96075
https://bugs.webkit.org/show_bug.cgi?id=68893

WK2 tests started crashing after r96070 for SL and Qt
(Requested by torarne on #webkit).

Patch by Sheriff Bot <webkit.review.bot@gmail.com> on 2011-09-27

Source/WebCore:

* page/FrameView.cpp:
(WebCore::FrameView::updateScrollCorner):
* platform/ScrollView.cpp:
(WebCore::ScrollView::setHasHorizontalScrollbar):
(WebCore::ScrollView::setHasVerticalScrollbar):
(WebCore::ScrollView::updateScrollbars):
* platform/ScrollableArea.cpp:
(WebCore::ScrollableArea::invalidateScrollCorner):
* platform/ScrollableArea.h:
* rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::destroyRootLayer):
* rendering/RenderScrollbarPart.cpp:
(WebCore::RenderScrollbarPart::imageChanged):

LayoutTests:

* compositing/iframes/repaint-after-losing-scrollbars-expected.png:
* platform/qt/Skipped:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@96102 268f45cc-cd09-0410-ab3c-d52691b4dbfc