Migrate PageSets to StorySets in buildbot page sets

tools/skp/page_sets/skia_worldjournal_nexus10.py

Index: tools/skp/page_sets/skia_worldjournal_nexus10.py
diff --git a/tools/skp/page_sets/skia_worldjournal_nexus10.py b/tools/skp/page_sets/skia_worldjournal_nexus10.py
index 42abb9673352383bea5bd2dd13b83f8b899e1a98..9444ea96c0c6d7b27d4c48147cc49c26f2c16b30 100644
--- a/tools/skp/page_sets/skia_worldjournal_nexus10.py
+++ b/tools/skp/page_sets/skia_worldjournal_nexus10.py
@@ -4,8 +4,9 @@
 # pylint: disable=W0401,W0614
 
 
+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 SkiaBuildbotDesktopPage(page_module.Page):
@@ -14,18 +15,17 @@ class SkiaBuildbotDesktopPage(page_module.Page):
     super(SkiaBuildbotDesktopPage, self).__init__(
         url=url,
         page_set=page_set,
-        credentials_path='data/credentials.json')
-    self.user_agent_type = 'tablet'
+        credentials_path='data/credentials.json',
+        shared_page_state_class=shared_page_state.Shared10InchTabletPageState)
     self.archive_data_file = 'data/skia_worldjournal_nexus10.json'
 
 
-class SkiaWorldjournalNexus10PageSet(page_set_module.PageSet):
+class SkiaWorldjournalNexus10PageSet(story.StorySet):
 
   """ Pages designed to represent the median, not highly optimized web """
 
   def __init__(self):
     super(SkiaWorldjournalNexus10PageSet, self).__init__(
-      user_agent_type='tablet',
       archive_data_file='data/skia_worldjournal_nexus10.json')
 
     urls_list = [