Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/trees/draw_property_utils.cc

Index: cc/trees/draw_property_utils.cc
diff --git a/cc/trees/draw_property_utils.cc b/cc/trees/draw_property_utils.cc
index 44b5fa4b79fb729710ad770ba385bfa4636e2704..f0d50b08d564da61583f7c4f738fe9c1a3d0c28e 100644
--- a/cc/trees/draw_property_utils.cc
+++ b/cc/trees/draw_property_utils.cc
@@ -706,11 +706,11 @@ bool LayerShouldBeSkipped(Layer* layer,
                                       effect_tree);
 }
 
-void FindLayersThatNeedUpdates(LayerTreeHost* layer_tree_host,
+void FindLayersThatNeedUpdates(LayerTree* layer_tree,
                                const TransformTree& transform_tree,
                                const EffectTree& effect_tree,
                                LayerList* update_layer_list) {
-  for (auto* layer : *layer_tree_host) {
+  for (auto* layer : *layer_tree) {
     bool layer_is_drawn =
         effect_tree.Node(layer->effect_tree_index())->is_drawn;