Get rid of compositing and squashing helper methods on RenderLayerModelObject.

Source/core/rendering/RenderLayerModelObject.cpp

Index: Source/core/rendering/RenderLayerModelObject.cpp
diff --git a/Source/core/rendering/RenderLayerModelObject.cpp b/Source/core/rendering/RenderLayerModelObject.cpp
index b7662e572a00cd6ef80ed8919ec05123424a07f0..3f5acdee95a0cb6c9cddfe002dfedd498196f7f1 100644
--- a/Source/core/rendering/RenderLayerModelObject.cpp
+++ b/Source/core/rendering/RenderLayerModelObject.cpp
@@ -186,20 +186,5 @@ void RenderLayerModelObject::addLayerHitTestRects(LayerHitTestRects& rects, cons
     }
 }
 
-CompositedLayerMappingPtr RenderLayerModelObject::compositedLayerMapping() const
-{
-    return m_layer ? m_layer->compositedLayerMapping() : 0;
-}
-
-bool RenderLayerModelObject::hasCompositedLayerMapping() const
-{
-    return m_layer ? m_layer->hasCompositedLayerMapping() : false;
-}
-
-CompositedLayerMapping* RenderLayerModelObject::groupedMapping() const
-{
-    return m_layer ? m_layer->groupedMapping() : 0;
-}
-
 } // namespace WebCore