XXX test gn format everything

chromeos/ime/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.
 
 action("gencode") {
   script = "gen_input_methods.py"
-  sources = [ "//chromeos/ime/input_methods.txt" ]
-  outputs = [
-    "$target_gen_dir/input_methods.h"
+  sources = [
+    "//chromeos/ime/input_methods.txt",
   ]
+  outputs = [ "$target_gen_dir/input_methods.h" ]
   args = [
     rebase_path("//chromeos/ime/input_methods.txt"),
     rebase_path("$target_gen_dir/input_methods.h"),
   ]
 }