Use gn_helpers to [se]serialize GN lists.

build/android/findbugs_diff.py

 #!/usr/bin/env python
 #
 # Copyright (c) 2012 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.
 
 """Runs findbugs, and returns an error code if there are new warnings.
 
 Other options
   --only-analyze used to only analyze the class you are interested.
@@ skipping 64 matching lines @@
 
   args = parser.parse_args(build_utils.ExpandFileArgs(sys.argv[1:]))
 
   run_tests_helper.SetLogLevel(args.verbose)
 
   devil_chromium.Initialize()
 
   if args.auxclasspath:
     args.auxclasspath = args.auxclasspath.split(':')
   elif args.auxclasspath_gyp:
-    args.auxclasspath = build_utils.ParseGypList(args.auxclasspath_gyp)
+    args.auxclasspath = build_utils.ParseGnList(args.auxclasspath_gyp)
 
   if args.base_dir:
     if not args.exclude:
       args.exclude = os.path.join(args.base_dir, 'findbugs_exclude.xml')
 
   findbugs_command, findbugs_warnings = findbugs.Run(
       args.exclude, args.only_analyze, args.auxclasspath,
       args.output_file, args.findbug_args, args.jar_paths)
 
   if findbugs_warnings:
@@ skipping 15 matching lines @@
               + args.jar_paths)
     if args.stamp:
       build_utils.Touch(args.stamp)
 
   return len(findbugs_warnings)
 
 
 if __name__ == '__main__':
   sys.exit(main())