Revert of cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/layers/delegated_renderer_layer.cc

 // 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 "cc/layers/delegated_renderer_layer.h"
 
 #include "cc/layers/delegated_renderer_layer_impl.h"
 #include "cc/output/delegated_frame_data.h"
 #include "cc/quads/render_pass_draw_quad.h"
 #include "cc/trees/layer_tree_host.h"
@@ skipping 15 matching lines @@
       weak_ptrs_(this) {
   frame_provider_->AddObserver(this);
 }
 
 DelegatedRendererLayer::~DelegatedRendererLayer() {
   frame_provider_->RemoveObserver(this);
 }
 
 scoped_ptr<LayerImpl> DelegatedRendererLayer::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
-  return DelegatedRendererLayerImpl::Create(tree_impl, layer_id_);
+  return DelegatedRendererLayerImpl::Create(
+      tree_impl, layer_id_).PassAs<LayerImpl>();
 }
 
 void DelegatedRendererLayer::SetLayerTreeHost(LayerTreeHost* host) {
   if (layer_tree_host() == host) {
     Layer::SetLayerTreeHost(host);
     return;
   }
 
   if (!host) {
     // The active frame needs to be removed from the active tree and resources
@@ skipping 46 matching lines @@
 
   SetNeedsPushProperties();
   return true;
 }
 
 bool DelegatedRendererLayer::HasDelegatedContent() const {
   return true;
 }
 
 }  // namespace cc