Only update style-determined composited reasons during the chicken/egg compositing update

Source/core/rendering/RenderLayer.h

Index: Source/core/rendering/RenderLayer.h
diff --git a/Source/core/rendering/RenderLayer.h b/Source/core/rendering/RenderLayer.h
index ecda5c771fbcc79c7fcf09434c19b922a6c357be..c188e54e0eb72c156da2251dcadcf3c26db955bd 100644
--- a/Source/core/rendering/RenderLayer.h
+++ b/Source/core/rendering/RenderLayer.h
@@ -466,9 +466,6 @@ public:
 
     const CompositingInputs& compositingInputs() const { ASSERT(!m_needsCompositingInputsUpdate); return m_compositingInputs; }
 
-    // FIXME: Remove this function.
-    bool potentiallyStaleIsUnclippedDescendant() const { return m_compositingInputs.isUnclippedDescendant; }
-
     bool lostGroupedMapping() const { ASSERT(isAllowedToQueryCompositingState()); return m_lostGroupedMapping; }
     void setLostGroupedMapping(bool b) { m_lostGroupedMapping = b; }