Convert GN visibility variables to lists.

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/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/repack.gni")
 
 # Arguments:
 #
@@ skipping 132 matching lines @@
   # limited looping capabilities).
   current_index = 0
   foreach(input_locale, invoker.input_locales) {
     output_locale = output_locales[current_index]
 
     # Compute the name of the target for the current file. Save it for the deps.
     current_name = "${target_name}_${input_locale}"
     locale_targets += [ ":$current_name" ]
 
     _repack_one_locale(current_name) {
-      visibility = ":$group_target_name"
+      visibility = [ ":$group_target_name" ]
       locale = input_locale
 
       # Compute the output name. Mac uses a different location.
       if (is_mac || is_ios) {
         output = "${root_gen_dir}/repack/${output_locale}.lproj/locale.pak"
       } 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
     }
     deps = locale_targets
   }
 }