Update perf page_set to use story_set

tools/perf/page_sets/polymer.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
 from telemetry.page import shared_page_state
 
 
 class PolymerPage(page_module.Page):
 
   def __init__(self, url, page_set, run_no_page_interactions):
     """ Base class for all polymer pages.
 
     Args:
       run_no_page_interactions: whether the page will run any interactions after
@@ skipping 192 matching lines @@
       action_runner.TapElement(element_function=element_function)
       action_runner.Wait(1) # wait for e.g. animations on the widget
 
   def SwipeWidget(self, action_runner, element_function):
     with action_runner.CreateInteraction('Swipe_Widget'):
       action_runner.SwipeElement(element_function=element_function,
                                  left_start_ratio=0.75,
                                  speed_in_pixels_per_second=300)
 
 
-class PolymerPageSet(page_set_module.PageSet):
+class PolymerPageSet(story.StorySet):
 
   def __init__(self, run_no_page_interactions=False):
     super(PolymerPageSet, self).__init__(
       archive_data_file='data/polymer.json',
-      bucket=page_set_module.PUBLIC_BUCKET)
+      cloud_storage_bucket=story.PUBLIC_BUCKET)
 
     self.AddUserStory(PolymerCalculatorPage(self, run_no_page_interactions))
     self.AddUserStory(PolymerShadowPage(self, run_no_page_interactions))
 
     # Polymer Sampler subpages that are interesting to tap / swipe elements on
     TAPPABLE_PAGES = [
         'paper-button',
         'paper-checkbox',
         'paper-fab',
         'paper-icon-button',
@@ skipping 16 matching lines @@
     for p in SCROLLABLE_PAGES:
       self.AddUserStory(PolymerSampler(
           self, p, run_no_page_interactions=run_no_page_interactions,
           scrolling_page=True))
 
     for page in self:
       assert (page.__class__.RunPageInteractions ==
               PolymerPage.RunPageInteractions), (
               'Pages in this page set must not override PolymerPage\' '
               'RunPageInteractions method.')