Simply rules for compositing fixed position elements

Source/core/rendering/compositing/CompositingReasonFinder.h

Index: Source/core/rendering/compositing/CompositingReasonFinder.h
diff --git a/Source/core/rendering/compositing/CompositingReasonFinder.h b/Source/core/rendering/compositing/CompositingReasonFinder.h
index 3bfeff01bd91055855b04af5a79e8c6350995177..1c42ec22dc8707500b9a8c5a4e68e900a7f9e888 100644
--- a/Source/core/rendering/compositing/CompositingReasonFinder.h
+++ b/Source/core/rendering/compositing/CompositingReasonFinder.h
@@ -25,9 +25,7 @@ public:
     void updateTriggers();
 
     bool hasOverflowScrollTrigger() const;
-
     bool requiresCompositingForScrollableFrame() const;
-    bool requiresCompositingForPositionFixed(RenderObject*, const RenderLayer*, RenderLayer::ViewportConstrainedNotCompositedReason*) const;
 
 private:
     bool isMainFrame() const;
@@ -36,6 +34,7 @@ private:
 
     bool requiresCompositingForTransform(RenderObject*) const;
     bool requiresCompositingForAnimation(RenderStyle*) const;
+    bool requiresCompositingForPositionFixed(RenderObject*) const;
 
     RenderView& m_renderView;
     CompositingTriggerFlags m_compositingTriggers;