[cc] Store CCLayerImpls as scoped_ptrs

cc/VideoLayerChromium.h

 // 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.
 
 
 #ifndef VideoLayerChromium_h
 #define VideoLayerChromium_h
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "LayerChromium.h"
 
 namespace WebKit {
 class WebVideoFrameProvider;
 }
 
 namespace cc {
 
 class CCVideoLayerImpl;
 
 // A Layer that contains a Video element.
 class VideoLayerChromium : public LayerChromium {
 public:
     static scoped_refptr<VideoLayerChromium> create(WebKit::WebVideoFrameProvider*);
 
-    virtual PassOwnPtr<CCLayerImpl> createCCLayerImpl() OVERRIDE;
+    virtual scoped_ptr<CCLayerImpl> createCCLayerImpl() OVERRIDE;
 
 private:
     explicit VideoLayerChromium(WebKit::WebVideoFrameProvider*);
     virtual ~VideoLayerChromium();
 
     // This pointer is only for passing to CCVideoLayerImpl's constructor. It should never be dereferenced by this class.
     WebKit::WebVideoFrameProvider* m_provider;
 };
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)
 
 #endif