Fix python scripts in src/ppapi/

ppapi/generators/idl_lexer.py

Index: ppapi/generators/idl_lexer.py
diff --git a/ppapi/generators/idl_lexer.py b/ppapi/generators/idl_lexer.py
old mode 100644
new mode 100755
index bf0b134e7048f33761eea7546f88da9d9c5eb735..ef46a091379836d4d8be4836bcbc3f00c4a22132
--- a/ppapi/generators/idl_lexer.py
+++ b/ppapi/generators/idl_lexer.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.
@@ -308,8 +307,6 @@ def TestExpect(tokens):
   return -1
 
 
-
-
 def Main(args):
   filenames = ParseOptions(args)
 
@@ -328,5 +325,6 @@ def Main(args):
     sys.stderr.write('%s\n' % str(le))
   return -1
 
+
 if __name__ == '__main__':
   sys.exit(Main(sys.argv[1:]))