Make ReflectorImpl use mailboxes

ui/compositor/layer_owner_delegate.h

Index: ui/compositor/layer_owner_delegate.h
diff --git a/ui/compositor/layer_owner_delegate.h b/ui/compositor/layer_owner_delegate.h
index e5362d923defe0f0cdf712e9b9846f918fc540e7..68ba92ee445673fb814168fda7812f505473d72a 100644
--- a/ui/compositor/layer_owner_delegate.h
+++ b/ui/compositor/layer_owner_delegate.h
@@ -13,7 +13,7 @@ class Layer;
 // Called from RecreateLayer() after the new layer was created. old_layer is
 // the layer that will be returned to the caller of RecreateLayer, new_layer
 // will be the layer now used. Used when the layer has external content
-// (SetExternalTexture / SetTextureMailbox / SetDelegatedFrame was called).
+// (SetTextureMailbox / SetDelegatedFrame was called).
 class COMPOSITOR_EXPORT LayerOwnerDelegate {
  public:
   virtual void OnLayerRecreated(Layer* old_layer, Layer* new_layer) = 0;