cc: Remove support for disabling non-root render surfaces.

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 11a354ab33e91e5fba1808882b707e6504131573..3203c0f2787d41c0fca62534e244937c29dc9af5 100644
--- a/cc/trees/layer_tree_host.cc
+++ b/cc/trees/layer_tree_host.cc
@@ -682,7 +682,6 @@ bool LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
     TRACE_EVENT0(
         TRACE_DISABLED_BY_DEFAULT("cc.debug.cdp-perf"),
         "LayerTreeHostInProcessCommon::ComputeVisibleRectsWithPropertyTrees");
-    bool can_render_to_separate_surface = true;
     PropertyTrees* property_trees = &property_trees_;
     if (!settings_.use_layer_lists) {
       // If use_layer_lists is set, then the property trees should have been
@@ -702,8 +701,7 @@ bool LayerTreeHost::DoUpdateLayers(Layer* root_layer) {
           TRACE_EVENT_SCOPE_THREAD, "property_trees",
           property_trees->AsTracedValue());
     }
-    draw_property_utils::UpdatePropertyTrees(this, property_trees,
-                                             can_render_to_separate_surface);
+    draw_property_utils::UpdatePropertyTrees(this, property_trees);
     draw_property_utils::FindLayersThatNeedUpdates(this, property_trees,
                                                    &update_layer_list);
   }