[Checkins] [zopefoundation/Zope] 08b2b9: Simplify isinstance check.

[GitHub]

  Branch: refs/heads/py3-final
  Home:   https://github.com/zopefoundation/Zope
  Commit: 08b2b906bcc76096b07d4a7ea3dad73a74e8c912
      https://github.com/zopefoundation/Zope/commit/08b2b906bcc76096b07d4a7ea3dad73a74e8c912
  Author: Hanno Schlichting <hanno at hannosch.eu>
  Date:   2017-05-31 (Wed, 31 May 2017)

  Changed paths:
    M src/ZPublisher/HTTPRequest.py

  Log Message:
  -----------
  Simplify isinstance check.