Convert GN visibility variables to lists.

content/shell/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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
@@ skipping 298 matching lines @@
 
   if (!enable_plugins) {
     sources -= [
       "browser/shell_plugin_service_filter.cc",
       "browser/shell_plugin_service_filter.h",
     ]
   }
 }
 
 grit("content_shell_resources_grit") {
-  visibility = ":*"
+  visibility = [ ":*" ]
   source = "shell_resources.grd"
   outputs = [
     "grit/shell_resources.h",
     "shell_resources.pak",
     "shell_resources.rc",
   ]
 }
 
 copy("copy_shell_resources") {
   sources = [ "$target_gen_dir/shell_resources.pak" ]
   outputs = [ "$root_out_dir/shell_resources.pak" ]
 
   deps = [ ":content_shell_resources_grit" ]
   forward_dependent_configs_from = [ ":content_shell_resources_grit" ]
 }
 
 # Font copies.
 if (!is_mac) {
   copy("copy_ahem") {
-    visibility = ":*"
+    visibility = [ ":*" ]
     sources = [ "renderer/test_runner/resources/fonts/AHEM____.TTF" ]
     outputs = [ "$root_out_dir/AHEM____.TTF" ]
   }
 }
 if (use_x11) {
   copy("copy_x11_fonts") {
-    visibility = ":*"
+    visibility = [ ":*" ]
     sources = [
       "renderer/test_runner/resources/fonts/fonts.conf",
       "//third_party/gardiner_mod/GardinerModBug.ttf",
       "//third_party/gardiner_mod/GardinerModCat.ttf",
     ]
     outputs = [ "$root_out_dir/{{source_file_part}}" ]
   }
 }
 if (is_android) {
   copy("copy_android_fonts") {
-    visibility = ":*"
+    visibility = [ ":*" ]
     sources = [
       "renderer/test_runner/resources/fonts/android_main_fonts.xml",
       "renderer/test_runner/resources/fonts/android_fallback_fonts.xml",
     ]
     outputs = [ "$root_out_dir/{{source_file_part}}" ]
   }
 }
 
 group("resources") {
   deps = [
@@ skipping 90 matching lines @@
   }
 
   if (!is_android || !is_android_webview_build) {
     # Some tests rely on this tool. It might be nicer if these tests relied on
     # image diff rather than having content shell depend on it.
     datadeps = [
       "//tools/imagediff($host_toolchain)",
     ]
   }
 }