[cc] Store CCLayerImpls as scoped_ptrs

cc/LayerChromium.cpp

 // Copyright 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 
 #if USE(ACCELERATED_COMPOSITING)
 #include "LayerChromium.h"
 
 #include "CCActiveAnimation.h"
@@ skipping 576 matching lines @@
     if (replicaLayer())
         replicaLayer()->pushPropertiesTo(layer->replicaLayer());
 
     m_layerAnimationController->pushAnimationUpdatesTo(layer->layerAnimationController());
 
     // Reset any state that should be cleared for the next update.
     m_stackingOrderChanged = false;
     m_updateRect = FloatRect();
 }
 
-PassOwnPtr<CCLayerImpl> LayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> LayerChromium::createCCLayerImpl()
 {
     return CCLayerImpl::create(m_layerId);
 }
 
 bool LayerChromium::drawsContent() const
 {
     return m_isDrawable;
 }
 
 bool LayerChromium::needMoreUpdates()
@@ skipping 182 matching lines @@
     return 0;
 }
 
 void sortLayers(std::vector<scoped_refptr<LayerChromium> >::iterator, std::vector<scoped_refptr<LayerChromium> >::iterator, void*)
 {
     // Currently we don't use z-order to decide what to paint, so there's no need to actually sort LayerChromiums.
 }
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)