Fix python scripts in src/ppapi/

ppapi/native_client/src/tools/srpcgen.py

-# -*- python -*-
+#!/usr/bin/env python
 # Copyright (c) 2012 The Native Client Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Build "SRPC" interfaces from specifications.
 
 SRPC interfaces consist of one or more interface classes, typically defined
 in a set of .srpc files.  The specifications are Python dictionaries, with a
 top level 'name' element and an 'rpcs' element.  The rpcs element is a list
 containing a number of rpc methods, each of which has a 'name', an 'inputs',
 and an 'outputs' element.  These elements are lists of input or output
 parameters, which are lists pairs containing a name and type.  The set of
 types includes all the SRPC basic types.
 
 These SRPC specifications are used to generate a header file and either a
 server or client stub file, as determined by the command line flag -s or -c.
 """
 
 import getopt
-#import re
-#import string
-#import StringIO
 import sys
 import os
 
 COPYRIGHT_AND_AUTOGEN_COMMENT = """\
 // Copyright (c) 2012 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.
 //
 // WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING
 //
@@ skipping 426 matching lines @@
     PrintClientFile(cc_file, h_file_name, specs, thread_check)
   elif mode == 'server':
     PrintHeaderFile(h_file, True, include_guard_name, interface_name, specs)
     PrintServerFile(cc_file, h_file_name, interface_name, specs)
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))