Update perf page_set to use story_set

tools/perf/page_sets/pathological_mobile_sites.py

Index: tools/perf/page_sets/pathological_mobile_sites.py
diff --git a/tools/perf/page_sets/pathological_mobile_sites.py b/tools/perf/page_sets/pathological_mobile_sites.py
index 2d34449b844cbd4cc361af5d0f3fc76003bf5e52..aa7b59c221cab7b0a844676907d261f77c889dfb 100644
--- a/tools/perf/page_sets/pathological_mobile_sites.py
+++ b/tools/perf/page_sets/pathological_mobile_sites.py
@@ -1,8 +1,8 @@
 # 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 page_set as page_set_module
 from telemetry.page import shared_page_state
 
 
@@ -19,14 +19,14 @@ class PathologicalMobileSitesPage(page_module.Page):
       action_runner.ScrollPage()
 
 
-class PathologicalMobileSitesPageSet(page_set_module.PageSet):
+class PathologicalMobileSitesPageSet(story.StorySet):
 
   """Pathologically bad and janky sites on mobile."""
 
   def __init__(self):
     super(PathologicalMobileSitesPageSet, self).__init__(
         archive_data_file='data/pathological_mobile_sites.json',
-        bucket=page_set_module.PARTNER_BUCKET)
+        cloud_storage_bucket=story.PARTNER_BUCKET)
 
     sites = ['http://edition.cnn.com',
              'http://m.espn.go.com/nhl/rankings',