Revert of [perfbot sheriff] Disables discourse.org in the infinite scroll pageset

tools/perf/page_sets/infinite_scroll_cases.py

 # Copyright 2015 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.
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
 
 TIME_TO_WAIT_BEFORE_STARTING_IN_SECONDS = 5
 SCROLL_TIMEOUT_IN_SECONDS = 120
 
@@ skipping 53 matching lines @@
         archive_data_file='data/infinite_scroll.json',
         cloud_storage_bucket=story.PARTNER_BUCKET)
     # The scroll distance is chosen such that the page can be scrolled
     # continuously through the test without hitting the end of the page.
     SCROLL_FAR = 60
     SCROLL_PAGE = 1
     pages = [
         ('https://www.facebook.com/shakira', 'facebook', SCROLL_FAR, 0, 0),
         ('https://twitter.com/taylorswift13', 'twitter', SCROLL_PAGE, 10, 30),
         ('http://techcrunch.tumblr.com/', 'tumblr', SCROLL_FAR, 0, 0),
-        ('https://www.flickr.com/explore', 'flickr', SCROLL_FAR, 0, 0)
-        # TODO(crbug.com/612153): This page needs to be rerecorded due to an
-        # expired SSL certificate, but can't be due to problems with WPR.
-        # pylint: disable=line-too-long
-        # ('https://meta.discourse.org/t/the-official-discourse-tags-plugin-discourse-tagging/26482',
-        # 'discourse', SCROLL_PAGE, 10, 30)
+        ('https://www.flickr.com/explore', 'flickr', SCROLL_FAR, 0, 0),
+        ('https://meta.discourse.org/t/the-official-discourse-tags-plugin-discourse-tagging/26482',
+         'discourse', SCROLL_PAGE, 10, 30)
     ]
     for (url, name, scroll_amount, delay, repeat) in pages:
       self.AddStory(
         InfiniteScrollPage(url, self, name, scroll_amount, delay, repeat))