Update perf page_set to use story_set

tools/perf/page_sets/page_reload_cases.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.
+from page_sets import top_pages
+from telemetry import story
 from telemetry.page import shared_page_state
-from telemetry.page import page_set as page_set_module
-
-from page_sets import top_pages
 
 
 def _Reload(action_runner):
   # Numbers below are chosen arbitrarily. For the V8DetachedContextAgeInGC
   # the number of reloads should be high enough so that V8 could do few
   # incremeantal GCs.
   NUMBER_OF_RELOADS = 7
   WAIT_TIME = 2
   for _ in xrange(NUMBER_OF_RELOADS):
     action_runner.ReloadPage()
     action_runner.Wait(WAIT_TIME)
 
 
 def _CreatePageClassWithReload(page_cls):
   class DerivedSmoothPage(page_cls):  # pylint: disable=W0232
 
     def RunPageInteractions(self, action_runner):
       _Reload(action_runner)
   return DerivedSmoothPage
 
 
-class PageReloadCasesPageSet(page_set_module.PageSet):
+class PageReloadCasesPageSet(story.StorySet):
 
   """ Pages for testing GC efficiency on page reload. """
 
   def __init__(self):
     super(PageReloadCasesPageSet, self).__init__(
         archive_data_file='data/top_25.json',
-        bucket=page_set_module.PARTNER_BUCKET)
+        cloud_storage_bucket=story.PARTNER_BUCKET)
 
     shared_desktop_state = shared_page_state.SharedDesktopPageState
 
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.GoogleWebSearchPage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.GmailPage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.GoogleCalendarPage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.GoogleDocPage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.GooglePlusPage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.YoutubePage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.WordpressPage)(self, shared_desktop_state))
     self.AddUserStory(_CreatePageClassWithReload(
         top_pages.FacebookPage)(self, shared_desktop_state))