[cc] Store CCLayerImpls as scoped_ptrs

cc/VideoLayerChromium.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 "VideoLayerChromium.h"
 
 #include "CCVideoLayerImpl.h"
 
 namespace cc {
 
 scoped_refptr<VideoLayerChromium> VideoLayerChromium::create(WebKit::WebVideoFrameProvider* provider)
 {
     return make_scoped_refptr(new VideoLayerChromium(provider));
 }
 
 VideoLayerChromium::VideoLayerChromium(WebKit::WebVideoFrameProvider* provider)
     : LayerChromium()
     , m_provider(provider)
 {
     ASSERT(m_provider);
 }
 
 VideoLayerChromium::~VideoLayerChromium()
 {
 }
 
-PassOwnPtr<CCLayerImpl> VideoLayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> VideoLayerChromium::createCCLayerImpl()
 {
-    return CCVideoLayerImpl::create(m_layerId, m_provider);
+    return CCVideoLayerImpl::create(m_layerId, m_provider).PassAs<CCLayerImpl>();
 }
 
 } // namespace cc
 
 #endif // USE(ACCELERATED_COMPOSITING)