Update the appengine code to use OAuth2 and break the gdata dependency.

remoting/client/appengine/main.py

 #!/usr/bin/env python
 
 # Copyright (c) 2011 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 logging
 import os
 
 from django.utils import simplejson as json
 
-import gdata.gauth
-import gdata.client
-
 from google.appengine.api import users
 from google.appengine.ext import webapp
 from google.appengine.ext.webapp import template
 from google.appengine.ext.webapp import util
 from google.appengine.ext.webapp.util import login_required
 
 import auth
 
 class HostListHandler(webapp.RequestHandler):
   """Renders the main hostlist page."""
   @login_required
   def get(self):
     template_params = {
-      'chromoting_token': auth.GetChromotingToken(throws=False),
+      'has_oauth2_tokens': auth.HasOAuth2Tokens(),
       'xmpp_token': auth.GetXmppToken(throws=False)
     }
     path = os.path.join(os.path.dirname(__file__), 'hostlist.html')
     self.response.out.write(template.render(path, template_params))
 
 
 class ChromotingSessionHandler(webapp.RequestHandler):
   """Renders one Chromoting session."""
   @login_required
   def get(self):
     template_params = {
       'hostname': self.request.get('hostname'),
       'username': users.get_current_user().email(),
       'hostjid': self.request.get('hostjid'),
       'connect_method': self.request.get('connect_method'),
       'insecure': self.request.get('insecure'),
       'xmpp_token': auth.GetXmppToken(),
-      'http_xmpp_proxy': auth.GetHttpXmppProxy(),
+      'http_xmpp_proxy': self.request.get('http_xmpp_proxy')
     }
     path = os.path.join(os.path.dirname(__file__), 'chromoting_session.html')
     self.response.out.write(template.render(path, template_params))
 
 
 def main():
   application = webapp.WSGIApplication(
       [
       ('/', HostListHandler),
       ('/session', ChromotingSessionHandler),
       ],
       debug=True)
   util.run_wsgi_app(application)
 
 
 if __name__ == '__main__':
   main()