Remove the GAE robot sample.

Reviewed in https://codereview.appspot.com/9368044/.
diff --git a/samples/appengine_with_robots/README b/samples/appengine_with_robots/README
deleted file mode 100644
index 277df01..0000000
--- a/samples/appengine_with_robots/README
+++ /dev/null
@@ -1,5 +0,0 @@
-Sample application that demonstrates how to use AppAssertionCredentials
-to access an API.
-
-api: urlshortener
-keywords: appengine oauth2
diff --git a/samples/appengine_with_robots/app.yaml b/samples/appengine_with_robots/app.yaml
deleted file mode 100644
index c313482..0000000
--- a/samples/appengine_with_robots/app.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-application: robot-sample
-version: 2
-runtime: python
-api_version: 1
-
-handlers:
-- url: .*
-  script: main.py
-
diff --git a/samples/appengine_with_robots/main.py b/samples/appengine_with_robots/main.py
deleted file mode 100644
index 7462024..0000000
--- a/samples/appengine_with_robots/main.py
+++ /dev/null
@@ -1,81 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 Google Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-"""Starting template for Google App Engine applications.
-
-Use this project as a starting point if you are just beginning to build a
-Google App Engine project which will access and manage data held under a role
-account for the App Engine app.  More information about using Google App Engine
-apps to call Google APIs can be found in Scenario 1 of the following document:
-
-<https://sites.google.com/site/oauthgoog/Home/google-oauth2-assertion-flow>
-"""
-
-__author__ = 'jcgregorio@google.com (Joe Gregorio)'
-
-
-import httplib2
-import logging
-import os
-import pickle
-
-from apiclient.discovery import build
-from google.appengine.api import memcache
-from google.appengine.ext import webapp
-from google.appengine.ext.webapp import template
-from google.appengine.ext.webapp.util import run_wsgi_app
-from oauth2client.appengine import AppAssertionCredentials
-
-credentials = AppAssertionCredentials(
-    scope='https://www.googleapis.com/auth/urlshortener')
-
-http = credentials.authorize(httplib2.Http(memcache))
-service = build("urlshortener", "v1", http=http)
-
-
-class MainHandler(webapp.RequestHandler):
-
-  def get(self):
-    path = os.path.join(os.path.dirname(__file__), 'welcome.html')
-    shortened = service.url().list().execute()
-    short_and_long = []
-    if 'items' in shortened:
-      short_and_long = [(item["id"], item["longUrl"]) for item in
-          shortened["items"]]
-
-    variables = {
-        'short_and_long': short_and_long,
-        }
-    self.response.out.write(template.render(path, variables))
-
-  def post(self):
-    long_url = self.request.get("longUrl")
-    credentials.refresh(http)
-    shortened = service.url().insert(body={"longUrl": long_url}).execute()
-    self.redirect("/")
-
-
-def main():
-  application = webapp.WSGIApplication(
-      [
-       ('/', MainHandler),
-      ],
-      debug=True)
-  run_wsgi_app(application)
-
-
-if __name__ == '__main__':
-  main()
diff --git a/samples/appengine_with_robots/welcome.html b/samples/appengine_with_robots/welcome.html
deleted file mode 100644
index a035ce8..0000000
--- a/samples/appengine_with_robots/welcome.html
+++ /dev/null
@@ -1,18 +0,0 @@
-<html>
-  <head>
-    <title>Welcome</title>
-  </head>
-  <body>
-    <form action="." method="post">
-      Long Url: <input name="longUrl" type="text" />
-      <input type="submit" />
-    </form>
-
-    <table>
-      <tr><th>Shortened</th><th>Original</th></tr>
-      {% for item in short_and_long %}
-        <tr><td><a href="{{ item.0 }}">{{ item.0 }}</a></td><td><a href="{{ item.1 }}">{{ item.1 }}</a></td></tr>
-      {% endfor %}
-    </table>
-  </body>
-</html>