[cc] Store CCLayerImpls as scoped_ptrs

cc/HeadsUpDisplayLayerChromium.cpp

 // Copyright 2012 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"
 
 #include "HeadsUpDisplayLayerChromium.h"
 
 #include "CCHeadsUpDisplayLayerImpl.h"
 #include "CCLayerTreeHost.h"
@@ skipping 38 matching lines @@
 {
     return true;
 }
 
 void HeadsUpDisplayLayerChromium::setFontAtlas(scoped_ptr<CCFontAtlas> fontAtlas)
 {
     m_fontAtlas = fontAtlas.Pass();
     setNeedsCommit();
 }
 
-PassOwnPtr<CCLayerImpl> HeadsUpDisplayLayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> HeadsUpDisplayLayerChromium::createCCLayerImpl()
 {
-    return CCHeadsUpDisplayLayerImpl::create(m_layerId);
+    return CCHeadsUpDisplayLayerImpl::create(m_layerId).PassAs<CCLayerImpl>();
 }
 
 void HeadsUpDisplayLayerChromium::pushPropertiesTo(CCLayerImpl* layerImpl)
 {
     LayerChromium::pushPropertiesTo(layerImpl);
 
     if (!m_fontAtlas.get())
         return;
 
     CCHeadsUpDisplayLayerImpl* hudLayerImpl = static_cast<CCHeadsUpDisplayLayerImpl*>(layerImpl);
     hudLayerImpl->setFontAtlas(m_fontAtlas.Pass());
 }
 
 }