Fix GN visibility for a few targets that are compiled by default in a GN build.

ui/resources/BUILD.gn

 # 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("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 # GYP version: ui/resources/ui_resources.gyp:ui_resources
 group("resources") {
   deps = [
@@ skipping 110 matching lines @@
       "//ui/chromeos/strings",
     ]
   }
 }
 
 # Repack just the strings for the framework locales on Mac and iOS. This
 # emulates repack_locales.py, but just for en-US. Note ui_test.pak is not simply
 # copied, because it causes leaks from allocations within system libraries when
 # trying to load non-string resources. http://crbug.com/413034.
 repack("repack_ui_test_mac_locale_pack") {
-  visibility = [ ":ui_test_pak" ]
+  visibility = [
+    ":ui_test_pak",
+    "//:gn_visibility",  # TODO(GYP): this shouldn't be necessary.
+  ]
 
   sources = [
     "$root_gen_dir/ui/strings/app_locale_settings_en-US.pak",
     "$root_gen_dir/ui/strings/ui_strings_en-US.pak",
   ]
 
   output = "$root_out_dir/ui/en.lproj/locale.pak"
 
   deps = [
     "//ui/strings",
   ]
 }