Refactor MutatorHostClient from LayerTreeHost to LayerTree.

content/renderer/gpu/gpu_benchmarking_extension.cc

Index: content/renderer/gpu/gpu_benchmarking_extension.cc
diff --git a/content/renderer/gpu/gpu_benchmarking_extension.cc b/content/renderer/gpu/gpu_benchmarking_extension.cc
index ca42a1831fbcda4098536447fe9a2af09bdd2460..46abb62da84fb8b104ee918f3ef2def80d4a70ad 100644
--- a/content/renderer/gpu/gpu_benchmarking_extension.cc
+++ b/content/renderer/gpu/gpu_benchmarking_extension.cc
@@ -126,7 +126,7 @@ class SkPictureSerializer {
   // Each layer in the tree is serialized into a separate skp file
   // in the given directory.
   void Serialize(const cc::Layer* root_layer) {
-    for (auto* layer : *root_layer->layer_tree_host()) {
+    for (auto* layer : *root_layer->GetLayerTree()) {
       sk_sp<SkPicture> picture = layer->GetPicture();
       if (!picture)
         continue;