Update perf page_set to use story_set

tools/perf/page_sets/top_10.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 shared_page_state
-from telemetry.page import page as page_module
-from telemetry.page import page_set as page_set_module
 
 
 class SimplePage(page_module.Page):
   def __init__(self, url, page_set, credentials='', name=''):
     super(SimplePage, self).__init__(
         url, page_set=page_set, name=name,
         credentials_path='data/credentials.json',
         shared_page_state_class=shared_page_state.SharedDesktopPageState)
     self.credentials = credentials
 
@@ skipping 62 matching lines @@
       url='http://www.facebook.com/barackobama',
       page_set=page_set,
       credentials='facebook',
       name='Facebook')
 
   def RunNavigateSteps(self, action_runner):
     super(Facebook, self).RunNavigateSteps(action_runner)
     action_runner.WaitForElement(text='About')
 
 
-class Top10PageSet(page_set_module.PageSet):
+class Top10PageSet(story.StorySet):
   """10 Pages chosen from Alexa top sites"""
 
   def __init__(self):
     super(Top10PageSet, self).__init__(
       archive_data_file='data/top_10.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
     # top google property; a google tab is often open
     self.AddUserStory(Google(self))
 
     # productivity, top google properties
     # TODO(dominikg): fix crbug.com/386152
     #self.AddUserStory(Gmail(self))
 
     # productivity, top google properties
     self.AddUserStory(GoogleCalendar(self))
@@ skipping 12 matching lines @@
     self.AddUserStory(SimplePage('http://www.amazon.com', self))
 
     # #4 Alexa
     self.AddUserStory(SimplePage('http://www.yahoo.com/', self))
 
     # #16 Alexa
     self.AddUserStory(SimplePage('http://www.bing.com/', self))
 
     # #20 Alexa
     self.AddUserStory(SimplePage('http://www.ask.com/', self))