Revert of Disable page_cycler.basic_oopif on zenbook bot

tools/perf/benchmarks/page_cycler.py

 # Copyright 2013 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.
 
-import os
-
 from core import perf_benchmark
 
 from measurements import page_cycler
 import page_sets
 from telemetry import benchmark
 
 
 class _PageCycler(perf_benchmark.PerfBenchmark):
   options = {'pageset_repeat': 6}
   cold_load_percent = 50  # % of page visits for which a cold load is forced
@@ skipping 228 matching lines @@
   """ A benchmark measuring performance of out-of-process iframes. """
   page_set = page_sets.OopifBasicPageSet
 
   @classmethod
   def Name(cls):
     return 'page_cycler_site_isolation.basic_oopif'
 
   def SetExtraBrowserOptions(self, options):
     options.AppendExtraBrowserArgs(['--site-per-process'])
 
-  @classmethod
-  def ShouldDisable(cls, possible_browser):  # http://crbug.com/596067
-    # This test is flaky on Zenbook laptops in the Chromium perf lab.
-    return 'Zenbook' in os.getenv('BUILDBOT_BUILDERNAME', '')
-
 
 @benchmark.Disabled('reference')  # crbug.com/523346
 class PageCyclerBasicOopif(_PageCycler):
   """ A benchmark measuring performance of the out-of-process iframes page
   set, without running in out-of-process iframes mode.. """
   page_set = page_sets.OopifBasicPageSet
 
   @classmethod
   def Name(cls):
     return 'page_cycler.basic_oopif'
 
 
 @benchmark.Disabled('all')  # crbug.com/443730
 class PageCyclerBigJs(_PageCycler):
   page_set = page_sets.BigJsPageSet
 
   @classmethod
   def Name(cls):
     return 'page_cycler.big_js'