Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/debug/rasterize_and_record_benchmark.h

Index: cc/debug/rasterize_and_record_benchmark.h
diff --git a/cc/debug/rasterize_and_record_benchmark.h b/cc/debug/rasterize_and_record_benchmark.h
index f52b838d22d76f907dfc6ee4b16761cf969d0d1f..f5f8e4599ed231d30698cd3feacd1a6febd7b502 100644
--- a/cc/debug/rasterize_and_record_benchmark.h
+++ b/cc/debug/rasterize_and_record_benchmark.h
@@ -23,7 +23,7 @@ class DictionaryValue;
 
 namespace cc {
 
-class LayerTreeHost;
+class LayerTree;
 class Layer;
 
 class RasterizeAndRecordBenchmark : public MicroBenchmark {
@@ -34,7 +34,7 @@ class RasterizeAndRecordBenchmark : public MicroBenchmark {
   ~RasterizeAndRecordBenchmark() override;
 
   // Implements MicroBenchmark interface.
-  void DidUpdateLayers(LayerTreeHost* host) override;
+  void DidUpdateLayers(LayerTree* layer_tree) override;
   void RunOnLayer(PictureLayer* layer) override;
 
   std::unique_ptr<MicroBenchmarkImpl> CreateBenchmarkImpl(
@@ -60,7 +60,7 @@ class RasterizeAndRecordBenchmark : public MicroBenchmark {
   // The following is used in DCHECKs.
   bool main_thread_benchmark_done_;
 
-  LayerTreeHost* host_;
+  LayerTree* layer_tree_;
 
   base::WeakPtrFactory<RasterizeAndRecordBenchmark> weak_ptr_factory_;
 };