Fix python scripts in src/media

media/tools/layout_tests/trend_graph_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 os
 import shutil
 import unittest
 
 from trend_graph import TrendGraph
 
@@ skipping 19 matching lines @@
     f.close()
     lineCount = 0
     for line in lines2:
       if '2008,0,1,13,45,00' in line:
         lineCount += 1
     self.assertEqual(lineCount, 2)
 
 
 if __name__ == '__main__':
   unittest.main()