Extensions Docs Server: Samples zip files

chrome/common/extensions/docs/server2/test_urlfetch.py

 # 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.
 
 import os
 
 def _ReadFile(filename):
   with open(filename, 'r') as f:
     return f.read()
 
 class _MockResponse(object):
   def __init__(self):
     self.content = ''
+    self.headers = { 'content-type': 'none' }
 
 def fetch(url):
   result = _MockResponse()
   result.content = _ReadFile(os.path.join('test_data', url))
   return result