Kill PageSet.AddPage and its remaining usage

tools/perf/measurements/task_execution_time_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.
 
 from measurements import task_execution_time
 from telemetry.core import wpr_modes
 from telemetry.page import page as page_module
 from telemetry.unittest_util import options_for_unittests
 from telemetry.unittest_util import page_test_test_case
 
@@ skipping 10 matching lines @@
     interaction.End()
 
 
 class TaskExecutionTimeUnitTest(page_test_test_case.PageTestTestCase):
   def setUp(self):
     self._options = options_for_unittests.GetCopy()
     self._options.browser_options.wpr_mode = wpr_modes.WPR_OFF
 
   def testCorrectNumberOfResultsReturned(self):
     ps = self.CreateEmptyPageSet()
-    ps.AddPage(TestTaskExecutionTimePage(ps, ps.base_dir))
+    ps.AddUserStory(TestTaskExecutionTimePage(ps, ps.base_dir))
     measurement = task_execution_time.TaskExecutionTime()
 
     results = self.RunMeasurement(measurement, ps, options=self._options)
 
     self.assertEquals(
         task_execution_time.TaskExecutionTime.GetExpectedResultCount(),
         len(results.all_page_specific_values))
 
   def testResultsAreDecreasing(self):
     ps = self.CreateEmptyPageSet()
-    ps.AddPage(TestTaskExecutionTimePage(ps, ps.base_dir))
+    ps.AddUserStory(TestTaskExecutionTimePage(ps, ps.base_dir))
     measurement = task_execution_time.TaskExecutionTime()
 
     results = self.RunMeasurement(measurement, ps, options=self._options)
 
     for first, second in zip(
         results.all_page_specific_values, results.all_page_specific_values[1:]):
       self.assertGreaterEqual(first.value, second.value)