Fix python scripts in src/tools/

tools/valgrind/valgrind_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.
 
-# valgrind_test.py
-
 """Runs an exe through Valgrind and puts the intermediate files in a
 directory.
 """
 
 import datetime
 import glob
 import logging
 import optparse
 import os
 import re
@@ skipping 1123 matching lines @@
       return Asan()
     try:
       platform_name = common.PlatformNames()[0]
     except common.NotImplementedError:
       platform_name = sys.platform + "(Unknown)"
     raise RuntimeError, "Unknown tool (tool=%s, platform=%s)" % (tool_name,
                                                                  platform_name)
 
 def CreateTool(tool):
   return ToolFactory().Create(tool)
-
-if __name__ == '__main__':
-  logging.error(sys.argv[0] + " can not be run from command line")
-  sys.exit(1)