Fix python scripts in src/ppapi/

ppapi/generators/idl_diff.py

Index: ppapi/generators/idl_diff.py
diff --git a/ppapi/generators/idl_diff.py b/ppapi/generators/idl_diff.py
old mode 100644
new mode 100755
index 9d1abbbe24407474ca17b0b559f43ce10aa0da1a..75a87dad92b767e608938f8e4a87633500def0c2
--- a/ppapi/generators/idl_diff.py
+++ b/ppapi/generators/idl_diff.py
@@ -1,5 +1,4 @@
-#!/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.
@@ -350,6 +349,6 @@ def Main(args):
       if input: print '  ** Matched expected diff. **'
       print '\n'
 
+
 if __name__ == '__main__':
   sys.exit(Main(sys.argv[1:]))
-