Update perf page_set to use story_set

tools/perf/page_sets/android_acceptance.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 AndroidAcceptancePage(page_module.Page):
 
   def __init__(self, url, page_set, name=''):
     super(AndroidAcceptancePage, self).__init__(
         url=url, page_set=page_set, name=name,
         # Android acceptance uses desktop.
         shared_page_state_class=shared_page_state.SharedDesktopPageState,
         credentials_path = 'data/credentials.json')
     self.archive_data_file = 'data/android_acceptance.json'
 
   def RunPageInteractions(self, action_runner):
     action_runner.Wait(40)
 
 
-class AndroidAcceptancePageSet(page_set_module.PageSet):
+class AndroidAcceptancePageSet(story.StorySet):
 
   """ Pages used in android acceptance testing. """
 
   def __init__(self):
     super(AndroidAcceptancePageSet, self).__init__(
       archive_data_file='data/android_acceptance.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
     urls_list = [
        'http://www.amazon.com',
        'http://www.cnn.com',
        'http://www.msn.com',
     ]
 
     for url in urls_list:
       self.AddUserStory(AndroidAcceptancePage(url, self))