Convert GN visibility variables to lists.

third_party/protobuf/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.
 
 if (is_win) {
   config_h_dir = "vsprojects"
 } else {
   config_h_dir = "."
 }
 
@@ skipping 87 matching lines @@
 
   # Required for component builds. See http://crbug.com/172800.
   defines = [ "LIBPROTOBUF_EXPORTS" ]
 }
 
 # This is the full, heavy protobuf lib that's needed for c++ .protos that don't
 # specify the LITE_RUNTIME option. The protocol compiler itself (protoc) falls
 # into that category. Do not use in Chrome code.
 
 source_set("protobuf_full") {
-  visibility = ":*"  # Prevent people from depending on this outside our file.
+  # Prevent people from depending on this outside our file.
+  visibility = [ ":*" ]
 
   sources = protobuf_lite_sources
   sources += [
     "src/google/protobuf/descriptor.h",
     "src/google/protobuf/descriptor.pb.h",
     "src/google/protobuf/descriptor_database.h",
     "src/google/protobuf/dynamic_message.h",
     "src/google/protobuf/generated_enum_reflection.h",
     "src/google/protobuf/generated_message_reflection.h",
     "src/google/protobuf/message.h",
@@ skipping 123 matching lines @@
       configs -= [ "//build/config/win:lean_and_mean" ]
     }
 
     cflags = protobuf_lite_cflags
 
     deps = [
       ":protobuf_full",
     ]
   }
 }