[Telemetry] Modify CreatePageSet to CreateStorySet

tools/perf/benchmarks/indexeddb_perf.py

 # Copyright 2013 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.
 
 """Runs Chromium's IndexedDB performance test. These test:
 
 Databases:
   create/delete
 Keys:
   create/delete
@@ skipping 72 matching lines @@
     power.PowerMetric.CustomizeBrowserOptions(options)
 
 class IndexedDb(perf_benchmark.PerfBenchmark):
   """Chromium's IndexedDB Performance tests."""
   test = _IndexedDbMeasurement
 
   @classmethod
   def Name(cls):
     return 'indexeddb_perf'
 
-  def CreatePageSet(self, options):
+  def CreateStorySet(self, options):
     indexeddb_dir = os.path.join(util.GetChromiumSrcDir(), 'chrome', 'test',
                                  'data', 'indexeddb')
     ps = page_set.PageSet(base_dir=indexeddb_dir)
     ps.AddUserStory(page_module.Page('file://perf_test.html', ps, ps.base_dir))
     return ps