cc: Remove some unnecessary const scoped_refptr&.

cc/layers/layer_proto_converter.h

 // Copyright 2015 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.
 
 #ifndef CC_LAYERS_LAYER_PROTO_CONVERTER_H_
 #define CC_LAYERS_LAYER_PROTO_CONVERTER_H_
 
 #include <unordered_map>
 
 #include "base/macros.h"
@@ skipping 49 matching lines @@
   LayerProtoConverter();
   ~LayerProtoConverter();
 
   // This method is the inner recursive function for SerializeLayerProperties
   // declared above.
   static void RecursivelySerializeLayerProperties(
       Layer* root_layer,
       proto::LayerUpdate* layer_update);
 
   using LayerIdMap = std::unordered_map<int, scoped_refptr<Layer>>;
-  // Start at |layer| and recursively add |layer| and all its children and
-  // special layers to |layer_id_map|.
-  static void RecursivelyFindAllLayers(const scoped_refptr<Layer>& layer,
+  // Start at |root_layer| and recursively add the layer and all its children
+  // and special layers to |layer_id_map|.
+  // TODO(vmpstr): LayerIdMap ref counts layers, so this function needs to deal
+  // with ref counted objects instead of iterating over raw pointers.
+  static void RecursivelyFindAllLayers(Layer* root_layer,
                                        LayerIdMap* layer_id_map);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_PROTO_CONVERTER_H_