Use new GN features in the build.

chrome/chrome_repack_locales.gni

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/repack.gni")
 
 # Arguments:
@@ skipping 134 matching lines @@
       } else {
         output = "${root_out_dir}/locales/${output_locale}.pak"
       }
     }
 
     current_index = current_index + 1
   }
 
   # The group that external targets depend on which collects all deps.
   group(group_target_name) {
-    if (defined(invoker.visibility)) {
-      visibility = invoker.visibility
-    }
+    forward_variables_from(invoker, [ "visibility" ])
     deps = locale_targets
   }
 }