Update perf page_set to use story_set

tools/perf/page_sets/key_mobile_sites_smooth.py

Index: tools/perf/page_sets/key_mobile_sites_smooth.py
diff --git a/tools/perf/page_sets/key_mobile_sites_smooth.py b/tools/perf/page_sets/key_mobile_sites_smooth.py
index c2f8b4a4bcf903104daa29602abeb1103cbc2c8f..97bb560dbbe4f7e4b1e0b17b77ec92eb2f5f0788 100644
--- a/tools/perf/page_sets/key_mobile_sites_smooth.py
+++ b/tools/perf/page_sets/key_mobile_sites_smooth.py
@@ -1,11 +1,10 @@
 # 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 key_mobile_sites_pages
+from telemetry import story
+from telemetry.page import page as page_module
+from telemetry.page import shared_page_state
 
 
 def _IssueMarkerAndScroll(action_runner):
@@ -128,14 +127,14 @@ class AmazonNicolasCageSmoothPage(
           distance_expr='document.body.scrollHeight - window.innerHeight')
 
 
-class KeyMobileSitesSmoothPageSet(page_set_module.PageSet):
+class KeyMobileSitesSmoothPageSet(story.StorySet):
 
   """ Key mobile sites with smooth interactions. """
 
   def __init__(self):
     super(KeyMobileSitesSmoothPageSet, self).__init__(
       archive_data_file='data/key_mobile_sites_smooth.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
 
     # Add pages with predefined classes that contain custom navigation logic.