Whittle down some compositing chicken/egg hacks

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 89042ccfb2a938198d669967b599325cb4f59e46..78d6278fc3e2348e3c0fb82a2d4aa4fa4a608116 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -3926,10 +3926,10 @@ void RenderLayer::updateFilters(const RenderStyle* oldStyle, const RenderStyle*
 void RenderLayer::styleChanged(StyleDifference diff, const RenderStyle* oldStyle)
 {
     m_stackingNode->updateIsNormalFlowOnly();
+    m_stackingNode->updateStackingNodesAfterStyleChange(oldStyle);
 
     if (m_scrollableArea)
         m_scrollableArea->updateAfterStyleChange(oldStyle);
-    m_stackingNode->updateStackingNodesAfterStyleChange(oldStyle);
 
     if (!oldStyle || oldStyle->visibility() != renderer()->style()->visibility()) {
         ASSERT(!oldStyle || diff >= StyleDifferenceRepaint);