Migrate from telemetry PageSet -> StorySet.

tools/chrome_proxy/integration_tests/chrome_proxy_pagesets/smoke.py

 # 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 page as page_module
-from telemetry.page import page_set as page_set_module
+from telemetry import story
 
 
 class SmokePage(page_module.Page):
 
   def __init__(self, url, page_set, name=''):
     super(SmokePage, self).__init__(url=url, page_set=page_set, name=name)
 
 
 class Page1(SmokePage):
 
@@ skipping 54 matching lines @@
   """
 
   def __init__(self, page_set):
     super(Page5, self).__init__(
       url='http://check.googlezip.net/static/',
       page_set=page_set,
       name='compression: css')
 
 
 
-class SmokePageSet(page_set_module.PageSet):
+class SmokeStorySet(story.StorySet):
 
   """ Chrome proxy test sites """
 
   def __init__(self):
-    super(SmokePageSet, self).__init__()
+    super(SmokeStorySet, self).__init__()
 
-    self.AddUserStory(Page1(self))
-    self.AddUserStory(Page2(self))
-    self.AddUserStory(Page3(self))
-    self.AddUserStory(Page4(self))
-    self.AddUserStory(Page5(self))
+    self.AddStory(Page1(self))
+    self.AddStory(Page2(self))
+    self.AddStory(Page3(self))
+    self.AddStory(Page4(self))
+    self.AddStory(Page5(self))