Fix testserver to return a correct MIME-type header....

net/tools/testserver/testserver.py

 #!/usr/bin/python2.4
 # Copyright (c) 2006-2008 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.
 
 """This is a simple HTTP server used for testing Chrome.
 
 It supports several test URLs, as specified by the handlers in TestPageHandler.
 It defaults to living on localhost:8888.
 It can use https if you specify the flag --https=CERT where CERT is the path
@@ skipping 132 matching lines @@
 
   def GetMIMETypeFromName(self, file_name):
     """Returns the mime type for the specified file_name. So far it only looks
     at the file extension."""
 
     (shortname, extension) = os.path.splitext(file_name)
     if len(extension) == 0:
       # no extension.
       return self._default_mime_type
 
-    return self._mime_types.get(extension, self._default_mime_type)
+    # extension starts with a dot, so we need to remove it
+    return self._mime_types.get(extension[1:], self._default_mime_type)
 
   def KillHandler(self):
     """This request handler kills the server, for use when we're done"
     with the a particular test."""
 
     if (self.path.find("kill") < 0):
       return False
 
     self.send_response(200)
     self.send_header('Content-type', 'text/html')
@@ skipping 939 matching lines @@
                            help='Directory from which to read the files')
   option_parser.add_option('', '--https', dest='cert',
                            help='Specify that https should be used, specify '
                            'the path to the cert containing the private key '
                            'the server should use')
   option_parser.add_option('', '--file-root-url', default='/files/',
                            help='Specify a root URL for files served.')
   options, args = option_parser.parse_args()
 
   sys.exit(main(options, args))