cc: Clean up RecordingSource API

cc/trees/layer_tree_host.cc

 // Copyright 2011 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/trees/layer_tree_host.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 88 matching lines @@
   for (int i = 0; i < layer_update_proto.layers_size(); ++i) {
     const proto::LayerProperties layer_properties_proto =
         layer_update_proto.layers(i);
     base_layer_properties_size += layer_properties_proto.base().ByteSize();
 
     if (layer_properties_proto.has_picture()) {
       const proto::PictureLayerProperties& picture_proto =
           layer_properties_proto.picture();
       picture_layer_properties_size += picture_proto.ByteSize();
 
-      const proto::RecordingSource& recording_source_proto =
-          picture_proto.recording_source();
       const proto::DisplayItemList& display_list_proto =
-          recording_source_proto.display_list();
+          picture_proto.display_list();
       display_item_list_size += display_list_proto.ByteSize();
 
       for (int j = 0; j < display_list_proto.items_size(); ++j) {
         const proto::DisplayItem& display_item = display_list_proto.items(j);
         if (display_item.type() == proto::DisplayItem::Type_Drawing)
           drawing_display_items_size += display_item.ByteSize();
       }
     }
   }
 
@@ skipping 1592 matching lines @@
   int seq_num = property_trees_.sequence_number;
   LayerTreeHostCommon::CallFunctionForEveryLayer(this, [seq_num](Layer* layer) {
     layer->set_property_tree_sequence_number(seq_num);
   });
 
   surface_client_id_ = proto.surface_client_id();
   next_surface_sequence_ = proto.next_surface_sequence();
 }
 
 }  // namespace cc