Revert 160631 - [cc] Store CCLayerImpls as scoped_ptrs

cc/DelegatedRendererLayerChromium.cpp

Index: cc/DelegatedRendererLayerChromium.cpp
===================================================================
--- cc/DelegatedRendererLayerChromium.cpp	(revision 160631)
+++ cc/DelegatedRendererLayerChromium.cpp	(working copy)
@@ -25,9 +25,9 @@
 {
 }
 
-scoped_ptr<CCLayerImpl> DelegatedRendererLayerChromium::createCCLayerImpl()
+PassOwnPtr<CCLayerImpl> DelegatedRendererLayerChromium::createCCLayerImpl()
 {
-    return CCDelegatedRendererLayerImpl::create(m_layerId).PassAs<CCLayerImpl>();
+    return CCDelegatedRendererLayerImpl::create(m_layerId);
 }
 
 }