Fix python scripts in src/ppapi/

ppapi/generators/generator.py

Index: ppapi/generators/generator.py
diff --git a/ppapi/generators/generator.py b/ppapi/generators/generator.py
index 3bb4ff5960152be896cfbf31896422f82e8424a5..005ea5cdff679e79f08cdd2d9a510f77866015f9 100755
--- a/ppapi/generators/generator.py
+++ b/ppapi/generators/generator.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.
@@ -15,16 +14,17 @@ from idl_c_header import HGen
 from idl_gen_pnacl import PnaclGen
 
 
-def Main(args):
+def Main():
+  args = sys.argv[1:]
+  # If no arguments are provided, assume we are tring to rebuild the
+  # C headers with warnings off.
+  if not args:
+    args = ['--wnone', '--cgen', '--range=start,end']
+
   filenames = ParseOptions(args)
   ast = ParseFiles(filenames)
   return Generator.Run(ast)
 
-if __name__ == '__main__':
-  args = sys.argv[1:]
-
-  # If no arguments are provided, assume we are tring to rebuild the
-  # C headers with warnings off.
-  if not args: args = ['--wnone', '--cgen', '--range=start,end']
 
-  sys.exit(Main(args))
+if __name__ == '__main__':
+  sys.exit(Main())