Merge 94107

Source/WebCore/page/FrameView.cpp

Index: Source/WebCore/page/FrameView.cpp
===================================================================
--- Source/WebCore/page/FrameView.cpp	(revision 94140)
+++ Source/WebCore/page/FrameView.cpp	(working copy)
@@ -2446,6 +2446,23 @@
     return false;
 }
 
+void FrameView::clearOwningRendererForCustomScrollbars(RenderBox* box)
+{
+    const HashSet<RefPtr<Widget> >* viewChildren = children();
+    HashSet<RefPtr<Widget> >::const_iterator end = viewChildren->end();
+    for (HashSet<RefPtr<Widget> >::const_iterator current = viewChildren->begin(); current != end; ++current) {
+        Widget* widget = current->get();
+        if (widget->isScrollbar()) {
+            Scrollbar* scrollbar = static_cast<Scrollbar*>(widget);
+            if (scrollbar->isCustomScrollbar()) {
+                RenderScrollbar* customScrollbar = toRenderScrollbar(scrollbar);
+                if (customScrollbar->owningRenderer() == box)
+                    customScrollbar->clearOwningRenderer();
+            }
+        }
+    }
+}
+
 FrameView* FrameView::parentFrameView() const
 {
     if (Widget* parentView = parent()) {