Remove a bunch of dead code from RenderLayer

sky/engine/core/rendering/RenderObject.h

Index: sky/engine/core/rendering/RenderObject.h
diff --git a/sky/engine/core/rendering/RenderObject.h b/sky/engine/core/rendering/RenderObject.h
index d84addc9619094ecf072cfd5890f32616c9141c6..d682ae58dec6e8fa1bcdba78456186e6f8ab6abf 100644
--- a/sky/engine/core/rendering/RenderObject.h
+++ b/sky/engine/core/rendering/RenderObject.h
@@ -619,7 +619,6 @@ public:
     // methods.
     const RenderLayerModelObject* containerForPaintInvalidation() const;
     const RenderLayerModelObject* adjustCompositedContainerForSpecialAncestors(const RenderLayerModelObject* paintInvalidationContainer) const;
-    bool isPaintInvalidationContainer() const;
 
     LayoutRect computePaintInvalidationRect()
     {
@@ -887,8 +886,6 @@ private:
     // For other cases, the caller should call setShouldDoFullPaintInvalidation() instead.
     void invalidatePaintForWholeRenderer() const;
 
-    const RenderLayerModelObject* enclosingCompositedContainer() const;
-
     bool hasImmediateNonWhitespaceTextChildOrPropertiesDependentOnColor() const;
 
     StyleDifference adjustStyleDifference(StyleDifference) const;