FileTypePolicies class to load types from proto.

chrome/browser/resources/safe_browsing/gen_file_type_proto.py

 #!/usr/bin/python
 # Copyright 2016 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.
 
 """
  Convert the ASCII download_file_types.asciipb proto into a binary resource.
 """
 
 import optparse
@@ skipping 17 matching lines @@
   ifile.close()
 
   # Parse it into a structure PB
   pb = config_pb2.DownloadFileTypeConfig()
   text_format.Merge(ascii_pb_str, pb)
 
   # Serialize it
   binary_pb_str = pb.SerializeToString()
 
   # Write it to disk
-  open(opts.outfile, 'w').write(binary_pb_str)
+  open(opts.outfile, 'wb').write(binary_pb_str)
 
 
 def main():
   parser = optparse.OptionParser()
   # TODO(nparker): Remove this once the bug is fixed.
   parser.add_option('-w', '--wrap', action="store_true", default=False,
                      help='Wrap this script in another python '
                      'execution to disable site-packages.  This is a '
                      'fix for http://crbug.com/605592')
   parser.add_option('-i', '--infile',
@@ skipping 20 matching lines @@
 
   try:
     ConvertProto(opts)
   except Exception as e:
     print "ERROR: %s failed to parse ASCII proto\n%s: %s\n" % (
         sys.argv, opts.infile, str(e))
     return 1
 
 if __name__ == '__main__':
   sys.exit(main())