Convert GN visibility variables to lists.

third_party/cld/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.
 
 config("cld_config") {
   defines = [ "CLD_WINDOWS" ]
   include_dirs = [ "." ]
 }
 
 static_library("cld") {
+  # This target includes its own copy of "base" which confuses the header
+  # checker.
+  check_includes = false
+
   sources = [
     "encodings/compact_lang_det/cldutil.cc",
     "encodings/compact_lang_det/cldutil.h",
     "encodings/compact_lang_det/cldutil_dbg.h",
     "encodings/compact_lang_det/cldutil_dbg_empty.cc",
     "encodings/compact_lang_det/compact_lang_det.cc",
     "encodings/compact_lang_det/compact_lang_det.h",
     "encodings/compact_lang_det/compact_lang_det_impl.cc",
     "encodings/compact_lang_det/compact_lang_det_impl.h",
     "encodings/compact_lang_det/ext_lang_enc.cc",
@@ skipping 81 matching lines @@
   }
 
   deps = [
     "//third_party/icu:icuuc",
   ]
 
   forward_dependent_configs_from = [
     "//third_party/icu:icuuc",
   ]
 }