Remove the CompositedLayerMappingPtr smart ptr.

Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp

Index: Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp
diff --git a/Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp b/Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp
index 31f2b652c5da93d54f8be3c31107e0c28b46f028..5c006ae3fc2401408aa6e5deaf3be93b240d4520 100644
--- a/Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp
+++ b/Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp
@@ -64,7 +64,7 @@ void GraphicsLayerTreeBuilder::rebuild(RenderLayer& layer, AncestorInfo info)
     layer.stackingNode()->updateLayerListsIfNeeded();
 
     const bool hasCompositedLayerMapping = layer.hasCompositedLayerMapping();
-    CompositedLayerMappingPtr currentCompositedLayerMapping = layer.compositedLayerMapping();
+    CompositedLayerMapping* currentCompositedLayerMapping = layer.compositedLayerMapping();
 
     // If this layer has a compositedLayerMapping, then that is where we place subsequent children GraphicsLayers.
     // Otherwise children continue to append to the child list of the enclosing layer.