Docserver: Update app version parsing since AppEngine started including /

chrome/common/extensions/docs/server2/appengine_url_fetcher.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 base64
 import posixpath
 
-from appengine_wrappers import GetAppVersion, urlfetch
+from appengine_wrappers import urlfetch
+from environment import GetAppVersion
 from future import Future
 
 
 def _MakeHeaders(username, password):
   headers = {
     'User-Agent': 'Chromium docserver %s' % GetAppVersion(),
     'Cache-Control': 'max-age=0',
   }
   if username is not None and password is not None:
     headers['Authorization'] = 'Basic %s' % base64.b64encode(
@@ skipping 22 matching lines @@
     urlfetch.make_fetch_call(rpc,
                              self._FromBasePath(url),
                              headers=_MakeHeaders(username, password))
     return Future(callback=lambda: rpc.get_result())
 
   def _FromBasePath(self, url):
     assert not url.startswith('/'), url
     if self._base_path is not None:
       url = posixpath.join(self._base_path, url) if url else self._base_path
     return url