Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/layers/layer_proto_converter.cc

 // 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.
 
 #include "cc/layers/layer_proto_converter.h"
 
 #include "base/stl_util.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/layers/empty_content_layer_client.h"
 #include "cc/layers/heads_up_display_layer.h"
@@ skipping 67 matching lines @@
     DCHECK(iter != layer_id_map.end());
 
     iter->second->FromLayerPropertiesProto(layer_properties);
   }
 }
 
 // static
 void LayerProtoConverter::RecursivelyFindAllLayers(Layer* root_layer,
                                                    LayerIdMap* layer_id_map) {
   LayerTreeHostCommon::CallFunctionForEveryLayer(
-      root_layer->layer_tree_host(),
+      root_layer->GetLayerTree(),
       [layer_id_map](Layer* layer) { (*layer_id_map)[layer->id()] = layer; });
 }
 
 // static
 scoped_refptr<Layer> LayerProtoConverter::FindOrAllocateAndConstruct(
     const proto::LayerNode& proto,
     const Layer::LayerIdMap& layer_id_map) {
   DCHECK(proto.has_id());
   Layer::LayerIdMap::const_iterator iter = layer_id_map.find(proto.id());
   if (iter != layer_id_map.end())
@@ skipping 19 matching lines @@
       return SolidColorScrollbarLayer::Create(ScrollbarOrientation::HORIZONTAL,
                                               -1, -1, false, Layer::INVALID_ID);
   }
   // TODO(nyquist): Add the rest of the necessary LayerTypes. This function
   // should not return null.
   NOTREACHED();
   return nullptr;
 }
 
 }  // namespace cc