[chrome-devtools-frontend] Migrate to cloudstorage client

gae/content_type.py

 # Copyright (c) 2013 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
 
 # W0232: 15,0:ContentHelper: Class has no __init__ method
 # pylint: disable=W0232
 class ContentHelper:
   content_extensions = {
     '.html'    : 'text/html',
     '.jpg'     : 'image/jpeg',
     '.gif'     : 'image/gif',
     '.png'     : 'image/png',
     '.js'      : 'application/x-javascript',
     '.css'     : 'text/css',
-    '.manifest': 'text/cache-manifest' }
+    '.manifest': 'text/cache-manifest',
+    '.zip'     : 'application/zip' }
 
   @staticmethod
   def content_type_from_path(path):
     _, extension = os.path.splitext(path)
     return ContentHelper.content_extensions.get(extension, 'text/plain')
 
 def from_path(path):
   return ContentHelper.content_type_from_path(path)