Update perf page_set to use story_set

tools/perf/page_sets/key_mobile_sites_repaint.py

 # Copyright 2014 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 telemetry.page import shared_page_state
-from telemetry.page import page as page_module
-from telemetry.page import page_set as page_set_module
-
 from page_sets import key_mobile_sites_pages
 from page_sets import repaint_helpers
-
+from telemetry import story
+from telemetry.page import page as page_module
+from telemetry.page import shared_page_state
 
 
 def _CreatePageClassWithRepaintInteractions(page_cls, mode, height, width):
   class DerivedRepaintPage(page_cls):  # pylint: disable=W0232
 
     def RunPageInteractions(self, action_runner):
       repaint_helpers.Repaint(
         action_runner, mode=mode, width=width, height=height)
 
   return DerivedRepaintPage
 
 
 class KeyMobileSitesRepaintPage(page_module.Page):
 
   def __init__(self, url, page_set, mode, height, width, name='', labels=None):
     super(KeyMobileSitesRepaintPage, self).__init__(
         url=url, page_set=page_set, name=name,
         shared_page_state_class=shared_page_state.SharedMobilePageState,
         credentials_path='data/credentials.json', labels=labels)
     self.archive_data_file = 'data/key_mobile_sites_repaint.json'
     self._mode = mode
     self._width = width
     self._height = height
 
   def RunPageInteractions(self, action_runner):
     repaint_helpers.Repaint(
         action_runner, mode=self._mode, width=self._width, height=self._height)
 
 
-class KeyMobileSitesRepaintPageSet(page_set_module.PageSet):
+class KeyMobileSitesRepaintPageSet(story.StorySet):
 
   """ Key mobile sites with repaint interactions. """
 
   def __init__(self, mode='viewport', width=None, height=None):
     super(KeyMobileSitesRepaintPageSet, self).__init__(
       archive_data_file='data/key_mobile_sites_repaint.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
 
     # Add pages with predefined classes that contain custom navigation logic.
     predefined_page_classes = [
       key_mobile_sites_pages.CapitolVolkswagenPage,
       key_mobile_sites_pages.TheVergeArticlePage,
       key_mobile_sites_pages.CnnArticlePage,
       key_mobile_sites_pages.FacebookPage,
       key_mobile_sites_pages.YoutubeMobilePage,
       key_mobile_sites_pages.LinkedInPage,
@@ skipping 128 matching lines @@
        'rsv_sug=0&rsv_sug4=3824&rsv_sug1=3&inputT=4920'),
       # Why: Top search engine
       'http://www.bing.com/search?q=sloths',
       # Why: Good example of poor initial scrolling
       'http://ftw.usatoday.com/2014/05/spelling-bee-rules-shenanigans'
     ]
 
     for url in urls_list:
       self.AddUserStory(KeyMobileSitesRepaintPage(
           url, self, mode=mode, height=height, width=width))