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

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index 4074061f723013ce0ad1ad8dfa7046dffc54ff04..82120007d69dff0db3d94f36d9cbe7f7e3f7aa23 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -987,13 +987,8 @@ void LayerImpl::SetHasRenderSurface(bool should_have_render_surface) {
 gfx::Transform LayerImpl::DrawTransform() const {
   // Only drawn layers have up-to-date draw properties.
   if (!is_drawn_render_surface_layer_list_member()) {
-    if (GetPropertyTrees()->non_root_surfaces_enabled) {
       return draw_property_utils::DrawTransform(this, GetTransformTree(),
                                                 GetEffectTree());
-    } else {
-      return draw_property_utils::ScreenSpaceTransform(this,
-                                                       GetTransformTree());
-    }
   }
 
   return draw_properties().target_space_transform;