Use new GN features in the build.

chrome/version.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/chrome_build.gni")
 
 # Runs the version processing script over the given template file to produce
 # an output file. This is used for generating various forms of files that
 # incorporate the product name and version.
 #
@@ skipping 109 matching lines @@
     if (defined(invoker.extra_args)) {
       args += invoker.extra_args
     }
     args += [
       rebase_path(template_path, root_build_dir),
       rebase_path(invoker.output, root_build_dir),
     ]
 
     if (process_only) {
       # When processing only, visibility gets applied to this target.
-      if (defined(invoker.visibility)) {
-        visibility = invoker.visibility
-      }
+      forward_variables_from(invoker, [ "visibility" ])
     } else {
       # When linking the result, only the source set can depend on the action.
       visibility = [ ":$source_set_name" ]
     }
   }
 
   if (!process_only) {
     source_set(source_set_name) {
-      if (defined(invoker.visibility)) {
-        visibility = invoker.visibility
-      }
+      forward_variables_from(invoker, [ "visibility" ])
       sources = get_target_outputs(":$action_name")
       public_deps = [
         ":$action_name",
       ]
     }
   }
 }