Update perf page_set to use story_set

tools/perf/page_sets/intl_ko_th_vi.py

Index: tools/perf/page_sets/intl_ko_th_vi.py
diff --git a/tools/perf/page_sets/intl_ko_th_vi.py b/tools/perf/page_sets/intl_ko_th_vi.py
index 8cafe2c756c110ebe4a6615c78dbe7dc27582a8f..abccf056d4fd803efa6837a50ec8e03a381c36bb 100644
--- a/tools/perf/page_sets/intl_ko_th_vi.py
+++ b/tools/perf/page_sets/intl_ko_th_vi.py
@@ -1,9 +1,9 @@
 # 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 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 IntlKoThViPage(page_module.Page):
@@ -15,14 +15,14 @@ class IntlKoThViPage(page_module.Page):
     self.archive_data_file = 'data/intl_ko_th_vi.json'
 
 
-class IntlKoThViPageSet(page_set_module.PageSet):
+class IntlKoThViPageSet(story.StorySet):
 
   """ Popular pages in Korean, Thai and Vietnamese. """
 
   def __init__(self):
     super(IntlKoThViPageSet, self).__init__(
       archive_data_file='data/intl_ko_th_vi.json',
-      bucket=page_set_module.PARTNER_BUCKET)
+      cloud_storage_bucket=story.PARTNER_BUCKET)
 
     urls_list = [
       # Why: #7 site in Vietnam