Update perf page_set to use story_set

tools/perf/page_sets/top_desktop_sites_2012Q3.py

Index: tools/perf/page_sets/top_desktop_sites_2012Q3.py
diff --git a/tools/perf/page_sets/top_desktop_sites_2012Q3.py b/tools/perf/page_sets/top_desktop_sites_2012Q3.py
index 667d8255e8489c3baee1bccd7a4cb82e9db21cdc..f87edb93f6ebe3cdee41affae14e8b19683eff71 100644
--- a/tools/perf/page_sets/top_desktop_sites_2012Q3.py
+++ b/tools/perf/page_sets/top_desktop_sites_2012Q3.py
@@ -2,9 +2,8 @@
 # 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
-from telemetry.page import page_set
-
 
 TOP_2013_URLS = [
   'http://www.facebook.com/barackobama',
@@ -259,13 +258,13 @@ class Top2012Q3Page(page.Page):
       action_runner.ScrollPage()
 
 
-class Top2012Q3PageSet(page_set.PageSet):
+class Top2012Q3PageSet(story.StorySet):
   """ Pages hand-picked from top-lists in Q32012. """
 
   def __init__(self):
     super(Top2012Q3PageSet, self).__init__(
       archive_data_file='data/2012Q3.json',
-      bucket=page_set.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
 
     for url in TOP_2013_URLS: