Remove page_cycler_v2.tough_layout_cases

tools/perf/benchmarks/page_cycler_v2.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.
 
 """The page cycler v2.
 
 For details, see design doc:
 https://docs.google.com/document/d/1EZQX-x3eEphXupiX-Hq7T4Afju5_sIdxPWYetj7ynd0
 """
 
@@ skipping 167 matching lines @@
   @classmethod
   def Name(cls):
     return 'page_cycler_v2.top_10_mobile'
 
   def CreateStorySet(self, options):
     return page_sets.Top10MobilePageSet(run_no_page_interactions=True,
         cache_temperatures=[
             cache_temperature.PCV1_COLD, cache_temperature.PCV1_WARM])
 
 
-@benchmark.Owner(emails=['kouhei@chromium.org', 'ksakamoto@chromium.org'])
-class PageCyclerV2ToughLayoutCases(_PageCyclerV2):
-  """Page loading for the slowest layouts observed in the Alexa top 1 million.
-
-  Recorded in July 2013.
-  """
-  page_set = page_sets.ToughLayoutCasesPageSet
-
-  @classmethod
-  def Name(cls):
-    return 'page_cycler_v2.tough_layout_cases'
-
-  def CreateStorySet(self, options):
-    return page_sets.ToughLayoutCasesPageSet(cache_temperatures=[
-          cache_temperature.PCV1_COLD, cache_temperature.PCV1_WARM])
-
-
 @benchmark.Disabled('reference', 'android')
 @benchmark.Owner(emails=['nasko@chromium.org'])
 class PageCyclerV2BasicOopifIsolated(_PageCyclerV2):
   """ A benchmark measuring performance of out-of-process iframes. """
   page_set = page_sets.OopifBasicPageSet
 
   @classmethod
   def Name(cls):
     return 'page_cycler_v2_site_isolation.basic_oopif'
 
@@ skipping 11 matching lines @@
   set, without running in out-of-process iframes mode.. """
   page_set = page_sets.OopifBasicPageSet
 
   @classmethod
   def Name(cls):
     return 'page_cycler_v2.basic_oopif'
 
   def CreateStorySet(self, options):
     return page_sets.OopifBasicPageSet(cache_temperatures=[
           cache_temperature.PCV1_COLD, cache_temperature.PCV1_WARM])