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

cc/layers/content_layer.cc

 // Copyright 2010 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/content_layer.h"
 
 #include "base/auto_reset.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "cc/layers/content_layer_client.h"
@@ skipping 81 matching lines @@
   return NeedsIdlePaint();
 }
 
 LayerUpdater* ContentLayer::Updater() const {
   return updater_.get();
 }
 
 void ContentLayer::CreateUpdaterIfNeeded() {
   if (updater_.get())
     return;
-  scoped_ptr<LayerPainter> painter = ContentLayerPainter::Create(client_);
+  scoped_ptr<LayerPainter> painter =
+      ContentLayerPainter::Create(client_).PassAs<LayerPainter>();
   if (layer_tree_host()->settings().per_tile_painting_enabled) {
     updater_ = BitmapSkPictureContentLayerUpdater::Create(
         painter.Pass(),
         rendering_stats_instrumentation(),
         id());
   } else {
     updater_ = BitmapContentLayerUpdater::Create(
         painter.Pass(),
         rendering_stats_instrumentation(),
         id());
@@ skipping 42 matching lines @@
   return picture;
 }
 
 void ContentLayer::OnOutputSurfaceCreated() {
   SetTextureFormat(
       layer_tree_host()->GetRendererCapabilities().best_texture_format);
   TiledLayer::OnOutputSurfaceCreated();
 }
 
 }  // namespace cc