Build Tools Cleanup

tools/list_files.py

Index: tools/list_files.py
diff --git a/tools/list_files.py b/tools/list_files.py
index e94443bb59f3b548f921f23c6af4254f0ae5eea3..73f25489ff3b7a93292f87823d4a57dc75625b30 100644
--- a/tools/list_files.py
+++ b/tools/list_files.py
@@ -1,13 +1,13 @@
 #!/usr/bin/env python
-# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+# Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
-'''Tool for listing files whose name match a pattern.
+"""Tool for listing files whose name match a pattern.
 
 Usage:
   python tools/list_files.py PATTERN DIRECTORY...
-'''
+"""
 
 import os
 import re