[Telemetry] Cleanup some unused variables in page_sets.

tools/perf/page_sets/memory_health_story.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.
 
 import logging
 import re
 
 from telemetry.page import page as page_module
 from telemetry.page import shared_page_state
 from telemetry import story
@@ skipping 18 matching lines @@
 ]
 
 
 class ForegroundPage(page_module.Page):
   """Take a measurement after loading a regular webpage."""
 
   def __init__(self, story_set, name, url):
     super(ForegroundPage, self).__init__(
         url=url, page_set=story_set, name=name,
         shared_page_state_class=shared_page_state.SharedMobilePageState)
-    self.archive_data_file = story_set.archive_data_file
 
   def _TakeMemoryMeasurement(self, action_runner, phase):
     action_runner.Wait(1)  # See crbug.com/540022#c17.
     with action_runner.CreateInteraction(phase):
       action_runner.Wait(DUMP_WAIT_TIME)
       action_runner.ForceGarbageCollection()
       action_runner.tab.browser.platform.FlushEntireSystemCache()
       action_runner.Wait(DUMP_WAIT_TIME)
       if not action_runner.tab.browser.DumpMemory():
         logging.error('Unable to get a memory dump for %s.', self.name)
@@ skipping 34 matching lines @@
         archive_data_file='data/memory_health_plan.json',
         cloud_storage_bucket=story.PARTNER_BUCKET)
 
     for url in URL_LIST:
       # We name pages so their foreground/background counterparts are easy
       # to identify. For example 'http://google.com' becomes
       # 'http_google_com' and 'after_http_google_com' respectively.
       name = re.sub('\W+', '_', url)
       self.AddStory(ForegroundPage(self, name, url))
       self.AddStory(BackgroundPage(self, 'after_' + name))