Don't destroy RenderWidgetCompositor during DoDeferredClose

cc/trees/layer_tree_host.cc

Index: cc/trees/layer_tree_host.cc
diff --git a/cc/trees/layer_tree_host.cc b/cc/trees/layer_tree_host.cc
index e80256df96b94e4a0274ecae060cf48cf1032433..7cda22f2a1d564641ae87b3cd4294841d09c953b 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -190,6 +190,10 @@ void LayerTreeHost::SetLayerTreeHostClientReady() {
   proxy_->SetLayerTreeHostClientReady();
 }
 
+void LayerTreeHost::SetLayerTreeHostClientFinished() {
+  proxy_->SetLayerTreeHostClientFinished();
+}
+
 static void LayerTreeHostOnOutputSurfaceCreatedCallback(Layer* layer) {
   layer->OnOutputSurfaceCreated();
 }