removed unneeded None

--HG--
extra : convert_revision : svn%3Ab85faa78-f9eb-468e-a121-7cced6da292c%40256

scrapy/trunk/scrapy/core/downloader/handlers.py

@@ -6,12 +6,11 @@ from __future__ import with_statement
 import os
 import urlparse
 
-from twisted.web.client import HTTPClientFactory
 from twisted.internet import defer, reactor
 from twisted.web import error as web_error
 
 from scrapy.core import signals
-from scrapy.http import Request, Response, Headers
+from scrapy.http import Request, Response, Headers, HTTPClientFactory
 from scrapy.core.exceptions import UsageError, HttpException
 from scrapy.utils.misc import defer_succeed
 from scrapy.conf import settings