Fix python scripts in src/media

media/tools/layout_tests/test_expectations_unittest.py

-#!/usr/bin/python
+#!/usr/bin/env 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.
 
 import unittest
 
 from test_expectations import TestExpectations
 
 
 class TestTestExpectations(unittest.TestCase):
@@ skipping 38 matching lines @@
     self.assertEquals(TestExpectations.ExtractTestOrDirectoryName(line),
                       'media/track/')
 
   def testExtractTestOrDirectoryNameWithException(self):
     self.assertRaises(ValueError,
                       TestExpectations.ExtractTestOrDirectoryName, 'Foo')
 
 
 if __name__ == '__main__':
   unittest.main()