Get rid of compositing and squashing helper methods on RenderLayerModelObject.

Source/core/rendering/RenderObject.h

Index: Source/core/rendering/RenderObject.h
diff --git a/Source/core/rendering/RenderObject.h b/Source/core/rendering/RenderObject.h
index 474e105716921b4273032c26904e82ca0bfad65c..4020c2fd9b2f92e7d73a7e316abf1d3009e4dc7e 100644
--- a/Source/core/rendering/RenderObject.h
+++ b/Source/core/rendering/RenderObject.h
@@ -800,7 +800,6 @@ public:
     // if painting is root-relative. This is the container that should be passed to the 'forPaintInvalidation'
     // methods.
     const RenderLayerModelObject* containerForPaintInvalidation() const;
-    const RenderLayerModelObject* enclosingCompositedContainer() const;
     const RenderLayerModelObject* adjustCompositedContainerForSpecialAncestors(const RenderLayerModelObject* paintInvalidationContainer) const;
     bool isPaintInvalidationContainer() const;
 
@@ -1079,6 +1078,8 @@ protected:
     void fullyInvalidatePaint(const RenderLayerModelObject* paintInvalidationContainer, InvalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds);
 
 private:
+    const RenderLayerModelObject* enclosingCompositedContainer() const;
+
     RenderBlock* containerForFixedPosition(const RenderLayerModelObject* paintInvalidationContainer = 0, bool* paintInvalidationContainerSkipped = 0) const;
 
     RenderFlowThread* locateFlowThreadContainingBlock() const;