[cc] Store CCLayerImpls as scoped_ptrs

cc/IOSurfaceLayerChromium.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 "IOSurfaceLayerChromium.h"
 
@@ skipping 16 matching lines @@
 {
 }
 
 void IOSurfaceLayerChromium::setIOSurfaceProperties(uint32_t ioSurfaceId, const IntSize& size)
 {
     m_ioSurfaceId = ioSurfaceId;
     m_ioSurfaceSize = size;
     setNeedsCommit();
 }
 
-PassOwnPtr<CCLayerImpl> IOSurfaceLayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> IOSurfaceLayerChromium::createCCLayerImpl()
 {
-    return CCIOSurfaceLayerImpl::create(m_layerId);
+    return CCIOSurfaceLayerImpl::create(m_layerId).PassAs<CCLayerImpl>();
 }
 
 bool IOSurfaceLayerChromium::drawsContent() const
 {
     return m_ioSurfaceId && LayerChromium::drawsContent();
 }
 
 void IOSurfaceLayerChromium::pushPropertiesTo(CCLayerImpl* layer)
 {
     LayerChromium::pushPropertiesTo(layer);
 
     CCIOSurfaceLayerImpl* textureLayer = static_cast<CCIOSurfaceLayerImpl*>(layer);
     textureLayer->setIOSurfaceProperties(m_ioSurfaceId, m_ioSurfaceSize);
 }
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)