Update perf page_set to use story_set

tools/perf/page_sets/maps.py

Index: tools/perf/page_sets/maps.py
diff --git a/tools/perf/page_sets/maps.py b/tools/perf/page_sets/maps.py
index 5bf64cdb95fca730193d3e6b08e08daf652707e4..d8cf90beb9d4ded366e15902045c62204729725f 100644
--- a/tools/perf/page_sets/maps.py
+++ b/tools/perf/page_sets/maps.py
@@ -2,10 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from telemetry.page import page as page_module
-from telemetry.page import page_set as page_set_module
-
 from page_sets import webgl_supported_shared_state
+from telemetry import story
+from telemetry.page import page as page_module
 
 
 class MapsPage(page_module.Page):
@@ -28,13 +27,13 @@ class MapsPage(page_module.Page):
       action_runner.WaitForJavaScriptCondition('window.testDone', 120)
 
 
-class MapsPageSet(page_set_module.PageSet):
+class MapsPageSet(story.StorySet):
 
   """ Google Maps examples """
 
   def __init__(self):
     super(MapsPageSet, self).__init__(
         archive_data_file='data/maps.json',
-        bucket=page_set_module.PUBLIC_BUCKET)
+        cloud_storage_bucket=story.PUBLIC_BUCKET)
 
     self.AddUserStory(MapsPage(self))