Update perf page_set to use story_set

tools/perf/page_sets/key_silk_cases.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 KeySilkCasesPage(page_module.Page):
 
   def __init__(self, url, page_set, run_no_page_interactions):
     """ Base class for all key silk cases pages.
 
     Args:
       run_no_page_interactions: whether the page will run any interactions after
         navigate steps.
@@ skipping 681 matching lines @@
     super(Masonry, self).__init__(
       url='file://key_silk_cases/masonry.html',
       page_set=page_set, run_no_page_interactions=run_no_page_interactions)
 
   def PerformPageInteractions(self, action_runner):
     with action_runner.CreateInteraction('animation_interaction'):
       action_runner.ExecuteJavaScript('window.brick()')
       action_runner.WaitForJavaScriptCondition('window.done')
 
 
-class KeySilkCasesPageSet(page_set_module.PageSet):
+class KeySilkCasesPageSet(story.StorySet):
 
   """ Pages hand-picked for project Silk. """
 
   def __init__(self, run_no_page_interactions=False):
     super(KeySilkCasesPageSet, self).__init__(
       archive_data_file='data/key_silk_cases.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
     self.AddUserStory(Page1(self, run_no_page_interactions))
     self.AddUserStory(Page2(self, run_no_page_interactions))
     self.AddUserStory(Page3(self, run_no_page_interactions))
     self.AddUserStory(Page4(self, run_no_page_interactions))
     self.AddUserStory(Page5(self, run_no_page_interactions))
     self.AddUserStory(Page6(self, run_no_page_interactions))
     self.AddUserStory(Page7(self, run_no_page_interactions))
     self.AddUserStory(Page8(self, run_no_page_interactions))
     self.AddUserStory(Page9(self, run_no_page_interactions))
@@ skipping 21 matching lines @@
     self.AddUserStory(UpdateHistoryState(self, run_no_page_interactions))
     self.AddUserStory(SilkFinance(self, run_no_page_interactions))
     self.AddUserStory(PolymerTopeka(self, run_no_page_interactions))
     self.AddUserStory(Masonry(self, run_no_page_interactions))
 
     for page in self:
       assert (page.__class__.RunPageInteractions ==
               KeySilkCasesPage.RunPageInteractions), (
               'Pages in this page set must not override KeySilkCasesPage\' '
               'RunPageInteractions method.')