Revert of [Telemetry] Ensure that story display names are unique

telemetry/telemetry/story/story_set.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 inspect
 import os
 
 from telemetry.story import story as story_module
 from telemetry.wpr import archive_info
 
@@ skipping 80 matching lines @@
   @property
   def wpr_archive_info(self):
     """Lazily constructs wpr_archive_info if it's not set and returns it."""
     if self.archive_data_file and not self._wpr_archive_info:
       self._wpr_archive_info = archive_info.WprArchiveInfo.FromFile(
           os.path.join(self.base_dir, self.archive_data_file), self.bucket)
     return self._wpr_archive_info
 
   def AddStory(self, story):
     assert isinstance(story, story_module.Story)
-    assert self._IsUnique(story), ('Tried to add story with duplicate display '
-                                   'name %s. Story display names should be '
-                                   'unique.' % story.display_name)
     self.stories.append(story)
 
-  def _IsUnique(self, story):
-    return not any((story.display_name == other.display_name) and
-                   sorted(story.grouping_keys.iteritems()) ==
-                       sorted(other.grouping_keys.iteritems())
-                   for other in self.stories)
-
   def RemoveStory(self, story):
     """Removes a Story.
 
     Allows the stories to be filtered.
     """
     self.stories.remove(story)
 
   @classmethod
   def Name(cls):
     """Returns the string name of this StorySet.
@@ skipping 33 matching lines @@
     return self.stories.__iter__()
 
   def __len__(self):
     return len(self.stories)
 
   def __getitem__(self, key):
     return self.stories[key]
 
   def __setitem__(self, key, value):
     self.stories[key] = value