Fix python scripts in src/tools/

tools/valgrind/asan/asan_test.py

-#!/usr/bin/python
 # Copyright (c) 2011 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.
 
-# asan_test.py
-
 """Wrapper for running the test under AddressSanitizer."""
 
 import datetime
 import logging
 import os
 import re
 
 import common
 import path_utils
 import suppressions
@@ skipping 33 matching lines @@
     logging.info('elapsed time: %02d:%02d:%02d', hours, minutes, seconds)
     logging.info('For more information on the AddressSanitizer bot see '
                  'http://dev.chromium.org/developers/testing/'
                  'addresssanitizer')
     return retcode
 
 
 def RunTool(args, supp_files, module):
   tool = ASanWrapper(supp_files)
   return tool.Main(args[1:])