[cc] Store CCLayerImpls as scoped_ptrs

cc/DelegatedRendererLayerChromium.cpp

Index: cc/DelegatedRendererLayerChromium.cpp
diff --git a/cc/DelegatedRendererLayerChromium.cpp b/cc/DelegatedRendererLayerChromium.cpp
index de34a003ba30cd5deaf3419fc2fc6d4d3c4b1687..721630dcc01e3f9982e2f41186a7444235c647be 100644
--- a/cc/DelegatedRendererLayerChromium.cpp
+++ b/cc/DelegatedRendererLayerChromium.cpp
@@ -25,9 +25,9 @@ DelegatedRendererLayerChromium::~DelegatedRendererLayerChromium()
 {
 }
 
-PassOwnPtr<CCLayerImpl> DelegatedRendererLayerChromium::createCCLayerImpl()
+scoped_ptr<CCLayerImpl> DelegatedRendererLayerChromium::createCCLayerImpl()
 {
-    return CCDelegatedRendererLayerImpl::create(m_layerId);
+    return CCDelegatedRendererLayerImpl::create(m_layerId).PassAs<CCLayerImpl>();
 }
 
 }