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

cc/layers/tiled_layer.cc

Index: cc/layers/tiled_layer.cc
diff --git a/cc/layers/tiled_layer.cc b/cc/layers/tiled_layer.cc
index 1f30b45a0c26c4f413da8582907f682b8f3bc1b4..854a74735515a0d1dce3ea36dee0966de27c1206 100644
--- a/cc/layers/tiled_layer.cc
+++ b/cc/layers/tiled_layer.cc
@@ -98,7 +98,7 @@ TiledLayer::TiledLayer()
 TiledLayer::~TiledLayer() {}
 
 scoped_ptr<LayerImpl> TiledLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
-  return TiledLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
+  return TiledLayerImpl::Create(tree_impl, id());
 }
 
 void TiledLayer::UpdateTileSizeAndTilingOption() {
@@ -277,7 +277,7 @@ UpdatableTile* TiledLayer::CreateTile(int i, int j) {
   tile->managed_resource()->SetDimensions(tiler_->tile_size(), texture_format_);
 
   UpdatableTile* added_tile = tile.get();
-  tiler_->AddTile(tile.PassAs<LayerTilingData::Tile>(), i, j);
+  tiler_->AddTile(tile.Pass(), i, j);
 
   added_tile->dirty_rect = tiler_->TileRect(added_tile);