Fix python scripts in src/tools/

tools/heapcheck/suppressions.py

-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 2006-2009 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.
 
-# suppressions.py
-
 """Valgrind-style suppressions for heapchecker reports.
 
 Suppressions are defined as follows:
 
 # optional one-line comments anywhere in the suppressions file.
 {
   Toolname:Errortype
   Short description of the error.
   fun:function_name
   fun:wildcarded_fun*_name
@@ skipping 142 matching lines @@
   mixed = GenSupp('...', 'foo*', 'function')
   assert mixed.Match(['foobar', 'foobaz', 'function'])
   assert not mixed.Match(['foobar', 'blah', 'function'])
   at_and_dollar = GenSupp('foo@GLIBC', 'bar@NOCANCEL')
   assert at_and_dollar.Match(['foo@GLIBC', 'bar@NOCANCEL'])
   re_chars = GenSupp('.*')
   assert re_chars.Match(['.foobar'])
   assert not re_chars.Match(['foobar'])
   print 'PASS'
 
+
 if __name__ == '__main__':
   MatchTest()