Revert of Four new pages added to tough_scheduling_cases

tools/perf/page_sets/tough_scheduling_cases.py

Index: tools/perf/page_sets/tough_scheduling_cases.py
diff --git a/tools/perf/page_sets/tough_scheduling_cases.py b/tools/perf/page_sets/tough_scheduling_cases.py
index 89f7fb5db77c518818efd26051051281f716ebe6..2cc7ca6f4dff4c7624feb3987dacd72f50bd5efc 100644
--- a/tools/perf/page_sets/tough_scheduling_cases.py
+++ b/tools/perf/page_sets/tough_scheduling_cases.py
@@ -371,8 +371,7 @@
   """ Tough scheduler latency test cases """
 
   def __init__(self):
-    super(ToughSchedulingCasesPageSet, self).__init__(
-        archive_data_file='data/tough_scheduling_cases.json')
+    super(ToughSchedulingCasesPageSet, self).__init__()
 
     # Why: Simple scrolling baseline
     self.AddPage(ToughSchedulingCasesPage(
@@ -466,14 +465,3 @@
       page_set=self))
     # Why: For measuring the latency of scroll-synchronized effects.
     self.AddPage(SynchronizedScrollOffsetPage(page_set=self))
-
-    real_pages_url_list = [
-        'http://www.latimes.com',
-        ('http://io9.com/the-10-most-shocking-characters-that-george-r-r-' +
-         'martin-1579481155/+tinaamini'),
-        'http://ftw.usatoday.com/2014/05/spelling-bee-rules-shenanigans',
-        'http://m.espn.go.com/nhl/rankings'
-    ]
-
-    for url in real_pages_url_list:
-      self.AddPage(ToughSchedulingCasesPage(url, self))