Remove the CompositedLayerMappingPtr smart ptr.

Source/core/rendering/compositing/CompositingLayerAssigner.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 39 matching lines @@
 void CompositingLayerAssigner::assign(RenderLayer* updateRoot, Vector<RenderLayer*>& layersNeedingRepaint)
 {
     TRACE_EVENT0("blink_rendering", "CompositingLayerAssigner::assign");
 
     SquashingState squashingState;
     assignLayersToBackingsInternal(updateRoot, squashingState, layersNeedingRepaint);
     if (squashingState.hasMostRecentMapping)
         squashingState.mostRecentMapping->finishAccumulatingSquashingLayers(squashingState.nextSquashedLayerIndex);
 }
 
-void CompositingLayerAssigner::SquashingState::updateSquashingStateForNewMapping(CompositedLayerMappingPtr newCompositedLayerMapping, bool hasNewCompositedLayerMapping)
+void CompositingLayerAssigner::SquashingState::updateSquashingStateForNewMapping(CompositedLayerMapping* newCompositedLayerMapping, bool hasNewCompositedLayerMapping)
 {
     // The most recent backing is done accumulating any more squashing layers.
     if (hasMostRecentMapping)
         mostRecentMapping->finishAccumulatingSquashingLayers(nextSquashedLayerIndex);
 
     nextSquashedLayerIndex = 0;
     boundingRect = IntRect();
     mostRecentMapping = newCompositedLayerMapping;
     hasMostRecentMapping = hasNewCompositedLayerMapping;
     haveAssignedBackingsToEntireSquashingLayerSubtree = false;
@@ skipping 212 matching lines @@
 
     RenderLayerStackingNodeIterator iterator(*layer->stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
     while (RenderLayerStackingNode* curNode = iterator.next())
         assignLayersToBackingsInternal(curNode->layer(), squashingState, layersNeedingRepaint);
 
     if (squashingState.hasMostRecentMapping && &squashingState.mostRecentMapping->owningLayer() == layer)
         squashingState.haveAssignedBackingsToEntireSquashingLayerSubtree = true;
 }
 
 }