Update perf page_set to use story_set

tools/perf/page_sets/top_25_repaint.py

Index: tools/perf/page_sets/top_25_repaint.py
diff --git a/tools/perf/page_sets/top_25_repaint.py b/tools/perf/page_sets/top_25_repaint.py
index 5a187a938332206b3708dbb3ac24d81ec40ae777..d4a5db2806ca02afd1787740bd1bb042d8471f88 100644
--- a/tools/perf/page_sets/top_25_repaint.py
+++ b/tools/perf/page_sets/top_25_repaint.py
@@ -1,12 +1,11 @@
 # 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.page import shared_page_state
-from telemetry.page import page as page_module
-from telemetry.page import page_set as page_set_module
-
-from page_sets import top_pages
 from page_sets import repaint_helpers
+from page_sets import top_pages
+from telemetry import story
+from telemetry.page import page as page_module
+from telemetry.page import shared_page_state
 
 
 class TopRepaintPage(page_module.Page):
@@ -38,14 +37,14 @@ def _CreatePageClassWithRepaintInteractions(page_cls, mode, width, height):
   return DerivedRepaintPage
 
 
-class Top25RepaintPageSet(page_set_module.PageSet):
+class Top25RepaintPageSet(story.StorySet):
 
   """ Pages hand-picked for 2012 CrOS scrolling tuning efforts. """
 
   def __init__(self, mode='viewport', width=None, height=None):
     super(Top25RepaintPageSet, self).__init__(
         archive_data_file='data/top_25_repaint.json',
-        bucket=page_set_module.PARTNER_BUCKET)
+        cloud_storage_bucket=story.PARTNER_BUCKET)
 
     top_page_classes = [
         top_pages.GoogleWebSearchPage,