Make sure that Apache for HTTP layout tests not to emit Content-Type by default

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/servers/apache_http.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 68 matching lines @@
             '-c', 'Alias /w3c/resources/WebIDLParser.js "%s/webidl2/lib/webidl2.js"' % imported_resources_dir,
             '-c', 'Alias /w3c/resources "%s"' % imported_resources_dir,
             '-c', 'Alias /forms-test-resources "%s"' % forms_test_resources_dir,
             '-c', 'Alias /media-resources "%s"' % media_resources_dir,
             '-c', 'TypesConfig "%s"' % mime_types_path,
             '-c', 'CustomLog "%s" common' % self._access_log_path,
             '-c', 'ErrorLog "%s"' % self._error_log_path,
             '-c', 'PidFile %s' % self._pid_file,
             '-c', 'SSLCertificateFile "%s"' % cert_file,
             '-c', 'Alias /inspector-sources "%s"' % inspector_sources_dir,
+            '-c', 'DefaultType None',
         ]
 
         if self._is_win:
             start_cmd += ['-c', "ThreadsPerChild %d" % (self._number_of_servers * 8)]
         else:
             start_cmd += ['-c', "StartServers %d" % self._number_of_servers,
                           '-c', "MinSpareServers %d" % self._number_of_servers,
                           '-c', "MaxSpareServers %d" % self._number_of_servers,
                           '-C', 'User "%s"' % self._port_obj.host.environ.get('USERNAME', self._port_obj.host.environ.get('USER', '')),
                           '-k', 'start']
@@ skipping 70 matching lines @@
         retval = proc.returncode
         err = proc.stderr.read()
         if retval or len(err):
             raise server_base.ServerError('Failed to stop %s: %s' % (self._name, err))
 
         # For some reason apache isn't guaranteed to have actually stopped after
         # the stop command returns, so we wait a little while longer for the
         # pid file to be removed.
         if not self._wait_for_action(lambda: not self._filesystem.exists(self._pid_file)):
             raise server_base.ServerError('Failed to stop %s: pid file still exists' % self._name)