Fix python scripts in src/build/

build/linux/rewrite_dirs.py

Index: build/linux/rewrite_dirs.py
diff --git a/build/linux/rewrite_dirs.py b/build/linux/rewrite_dirs.py
index 9e166d0efd1b3d889ae689b3a2f7777c05e88613..7f422a68bd26c24843e5e6d234aa8026b681b758 100755
--- a/build/linux/rewrite_dirs.py
+++ b/build/linux/rewrite_dirs.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 # Copyright (c) 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.
@@ -31,6 +31,7 @@ def RewritePath(path, opts):
   else:
     return path
 
+
 def RewriteLine(line, opts):
   """Rewrites all the paths in recognized options."""
   args = line.split()
@@ -53,6 +54,7 @@ def RewriteLine(line, opts):
 
   return ' '.join(args)
 
+
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option('-s', '--sysroot', default='/', help='sysroot to prepend')
@@ -64,5 +66,6 @@ def main(argv):
     print line
   return 0
 
+
 if __name__ == '__main__':
   sys.exit(main(sys.argv))