Replace twitter with pinterest in v8.mobile_infinite_scroll_tbmv2.

tools/perf/page_sets/mobile_infinite_scroll_cases.py

 # Copyright 2016 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 page_sets import mobile_facebook_page
 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 66 matching lines @@
   def __init__(self):
     super(MobileInfiniteScrollPageSet, self).__init__(
         archive_data_file='data/mobile_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://m.facebook.com/shakira', 'facebook', SCROLL_FAR, 0, 0),
-        ('https://mobile.twitter.com/taylorswift13', 'twitter', SCROLL_PAGE, 10, 30),
+        ('https://www.pinterest.com/all', 'pinterest', SCROLL_FAR, 0, 0),
         ('http://techcrunch.tumblr.com/', 'tumblr', SCROLL_FAR, 0, 0),
         ('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)
     ]
     self.AddStory(
       MobileInfiniteScrollFacebookPage(pages[0][0], self, pages[0][1],
                                        pages[0][2], pages[0][3], pages[0][4]))
     for (url, name, scroll_amount, delay, repeat) in pages[1:]:
       self.AddStory(
         MobileInfiniteScrollPage(url, self, name, scroll_amount, delay, repeat))