Update perf page_set to use story_set

tools/perf/page_sets/key_desktop_move_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 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 KeyDesktopMoveCasesPage(page_module.Page):
 
   def __init__(self, url, page_set, name='', credentials=None):
     super(KeyDesktopMoveCasesPage, self).__init__(
         url=url, page_set=page_set, name=name,
         credentials_path='data/credentials.json',
         shared_page_state_class=shared_page_state.SharedDesktopPageState)
     self.archive_data_file = 'data/key_desktop_move_cases.json'
@@ skipping 85 matching lines @@
   def RunPageInteractions(self, action_runner):
     for _ in range(3):
       action_runner.Wait(2)
       with action_runner.CreateGestureInteraction(
           'DragAction', repeatable=True):
         action_runner.DragPage(left_start_ratio=0.5, top_start_ratio=0.75,
                                left_end_ratio=0.75, top_end_ratio=0.5)
     # TODO(ssid): Add zoom gestures after fixing bug crbug.com/462214.
 
 
-class KeyDesktopMoveCasesPageSet(page_set_module.PageSet):
+class KeyDesktopMoveCasesPageSet(story.StorySet):
 
   """ Special cases for move gesture """
 
   def __init__(self):
     super(KeyDesktopMoveCasesPageSet, self).__init__(
       archive_data_file='data/key_desktop_move_cases.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
     self.AddUserStory(GmailMouseScrollPage(self))
     self.AddUserStory(GoogleMapsPage(self))