Update perf page_set to use story_set

tools/perf/page_sets/key_desktop_sites.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 import story
 from telemetry.page import page as page_module
-from telemetry.page import page_set as page_set_module
 
 
 class KeyDesktopSitesPage(page_module.Page):
 
   def __init__(self, url, page_set):
     super(KeyDesktopSitesPage, self).__init__(
         url=url, page_set=page_set, credentials_path = 'data/credentials.json')
     self.archive_data_file = 'data/key_desktop_sites.json'
 
   def RunPageInteractions(self, action_runner):
@@ skipping 82 matching lines @@
       }'''
     self.credentials = 'google'
 
   def RunPageInteractions(self, action_runner):
     with action_runner.CreateGestureInteraction('ScrollAction'):
       action_runner.ScrollPage()
     action_runner.WaitForJavaScriptCondition(
         'document.getElementsByClassName("kix-appview-editor").length')
 
 
-class KeyDesktopSitesPageSet(page_set_module.PageSet):
+class KeyDesktopSitesPageSet(story.StorySet):
 
   """ Sites of Interest """
 
   def __init__(self):
     super(KeyDesktopSitesPageSet, self).__init__(
       archive_data_file='data/key_desktop_sites.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
     self.AddUserStory(FacebookPage(self))
     self.AddUserStory(GmailPage(self))
     self.AddUserStory(GoogleCalendarPage(self))
     self.AddUserStory(GoogleDrivePage(self))
     self.AddUserStory(GoogleDocPage(self))
 
     urls_list = [
       'http://www.google.com/nexus/5/#/',
       'http://youtube.com',
@@ skipping 710 matching lines @@
        '&q=black%20screen%20amd&colspec=ID%20Pri%20Mstone%20ReleaseBlock%20OS'
        '%20Area%20Feature%20Status%20Owner%20Summary'),
       'http://mlb.mlb.com/index.jsp',
       'http://www.nfl.com/',
       'http://airbnb.github.com/infinity/demo-on.html',
       'http://habrahabr.ru/post/149892/#habracut'
     ]
 
     for url in urls_list:
       self.AddUserStory(KeyDesktopSitesPage(url, self))