Update ui_unscaled_resources.rc comment

ui/resources/BUILD.gn

Index: ui/resources/BUILD.gn
diff --git a/ui/resources/BUILD.gn b/ui/resources/BUILD.gn
index b3493a186b02ae4d75a2ee33e93e734369a555ea..b81ff0106b5587d0f7e1d586c7d2af4c4fdc76e2 100644
--- a/ui/resources/BUILD.gn
+++ b/ui/resources/BUILD.gn
@@ -30,11 +30,6 @@ grit("ui_unscaled_resources_grd") {
   use_qualified_include = true
   outputs = [
     "grit/ui_unscaled_resources.h",
-
-    # TODO(GYP_GONE) when GYP is gone, this line should be deleted, and the grit
-    # file updated to no longer list this as an output. We use resource bundles
-    # rather than .rc files, but the GYP build still expects this file to
-    # exist.
     "ui_unscaled_resources.rc",
   ]
 }