Remove the CompositedLayerMappingPtr smart ptr.

Source/core/rendering/compositing/GraphicsLayerUpdater.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 73 matching lines @@
 void GraphicsLayerUpdater::update(RenderLayer& layer, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
 {
     TRACE_EVENT0("blink_rendering", "GraphicsLayerUpdater::update");
     updateRecursive(layer, DoNotForceUpdate, UpdateContext(), layersNeedingPaintInvalidation);
     layer.compositor()->updateRootLayerPosition();
 }
 
 void GraphicsLayerUpdater::updateRecursive(RenderLayer& layer, UpdateType updateType, const UpdateContext& context, Vector<RenderLayer*>& layersNeedingPaintInvalidation)
 {
     if (layer.hasCompositedLayerMapping()) {
-        CompositedLayerMappingPtr mapping = layer.compositedLayerMapping();
+        CompositedLayerMapping* mapping = layer.compositedLayerMapping();
 
         if (updateType == ForceUpdate || mapping->needsGraphicsLayerUpdate()) {
             const RenderLayer* compositingContainer = context.compositingContainer(layer);
             ASSERT(compositingContainer == layer.enclosingLayerWithCompositedLayerMapping(ExcludeSelf));
 
             if (mapping->updateRequiresOwnBackingStoreForAncestorReasons(compositingContainer)) {
                 layersNeedingPaintInvalidation.append(&layer);
                 updateType = ForceUpdate;
             }
 
@@ skipping 31 matching lines @@
     if (layer.hasCompositedLayerMapping())
         layer.compositedLayerMapping()->assertNeedsToUpdateGraphicsLayerBitsCleared();
 
     for (RenderLayer* child = layer.firstChild(); child; child = child->nextSibling())
         assertNeedsToUpdateGraphicsLayerBitsCleared(*child);
 }
 
 #endif
 
 } // namespace blink