[cc] Store CCLayerImpls as scoped_ptrs

cc/SolidColorLayerChromium.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"
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "SolidColorLayerChromium.h"
 
 #include "CCSolidColorLayerImpl.h"
 
 namespace cc {
 
-PassOwnPtr<CCLayerImpl> SolidColorLayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> SolidColorLayerChromium::createCCLayerImpl()
 {
-    return CCSolidColorLayerImpl::create(id());
+    return CCSolidColorLayerImpl::create(id()).PassAs<CCLayerImpl>();
 }
 
 scoped_refptr<SolidColorLayerChromium> SolidColorLayerChromium::create()
 {
     return make_scoped_refptr(new SolidColorLayerChromium());
 }
 
 SolidColorLayerChromium::SolidColorLayerChromium()
     : LayerChromium()
 {
 }
 
 SolidColorLayerChromium::~SolidColorLayerChromium()
 {
 }
 
 } // namespace cc
 
 #endif // USE(ACCELERATED_COMPOSITING)