[Telemetry] Rename PageRun to UserStoryRun part of switching from PageTestResults to UserStoryTestR…

tools/telemetry/telemetry/results/page_test_results_unittest.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.
 
 import os
 
 from telemetry import page as page_module
 from telemetry.page import page_set
 from telemetry.results import base_test_results_unittest
 from telemetry.results import page_test_results
@@ skipping 37 matching lines @@
   def testSkips(self):
     results = page_test_results.PageTestResults()
     results.WillRunPage(self.pages[0])
     results.AddValue(skip.SkipValue(self.pages[0], 'testing reason'))
     results.DidRunPage(self.pages[0])
 
     results.WillRunPage(self.pages[1])
     results.DidRunPage(self.pages[1])
 
     self.assertTrue(results.all_page_runs[0].skipped)
-    self.assertEqual(self.pages[0], results.all_page_runs[0].page)
+    self.assertEqual(self.pages[0], results.all_page_runs[0].user_story)
     self.assertEqual(set([self.pages[0], self.pages[1]]),
                      results.pages_that_succeeded)
 
     self.assertEqual(2, len(results.all_page_runs))
     self.assertTrue(results.all_page_runs[0].skipped)
     self.assertTrue(results.all_page_runs[1].ok)
 
   def testBasic(self):
     results = page_test_results.PageTestResults()
     results.WillRunPage(self.pages[0])
@@ skipping 190 matching lines @@
     results.WillRunPage(self.pages[0])
     results.AddValue(v0)
     results.DidRunPage(self.pages[0])
 
     results.WillRunPage(self.pages[1])
     results.AddValue(v1)
     results.DidRunPage(self.pages[1])
 
     results.CleanUp()
     self.assertFalse(results.FindAllTraceValues())