Remove redundant update of viewport layer types

cc/trees/layer_tree_impl.h

Index: cc/trees/layer_tree_impl.h
diff --git a/cc/trees/layer_tree_impl.h b/cc/trees/layer_tree_impl.h
index 3aeb0096416fb5344ab72f3265727c711a10d23f..9f3418bc9e43d8b7c3c1c14b34af29e18b167840 100644
--- a/cc/trees/layer_tree_impl.h
+++ b/cc/trees/layer_tree_impl.h
@@ -221,9 +221,6 @@ class CC_EXPORT LayerTreeImpl {
                                 int inner_viewport_scroll_layer_id,
                                 int outer_viewport_scroll_layer_id);
   void ClearViewportLayers();
-  // Sets the viewport layer types. This depends on the viewport layers from
-  // SetViewportLayersFromIds and the viewport layer's scroll_clip_layer_ids.
-  void UpdateViewportLayerTypes();
   LayerImpl* OverscrollElasticityLayer() {
     return LayerById(overscroll_elasticity_layer_id_);
   }