Revert of [Telemetry] Introduce shared_user_story_state for real.

tools/telemetry/telemetry/user_story/shared_user_story_state.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.
-
-
-class SharedUserStoryState(object):
-  """A class that manages the test state across multiple user stories.
-  It's styled on unittest.TestCase for handling test setup & teardown logic.
-
-  """
-
-  def __init__(self, test, options, user_story_set):
-    """ This method is styled on unittest.TestCase.setUpClass.
-    Override to do any action before running user stories that
-    share this same state.
-    Args:
-      test: a page_test.PageTest instance.
-      options: a BrowserFinderOptions instance that contains command line
-        options.
-      user_story_set: a user_story_set.UserStorySet instance.
-    """
-    pass
-
-  @property
-  def platform(self):
-    """ Override to return the platform which user stories that share this same
-    state will be run on.
-    """
-    raise NotImplementedError()
-
-  def WillRunUserStory(self, user_story):
-    """ Override to do any action before running each one of all user stories
-    that share this same state.
-    This method is styled on unittest.TestCase.setUp.
-    """
-    raise NotImplementedError()
-
-  def DidRunUserStory(self, results):
-    """ Override to do any action after running each of all user stories that
-    share this same state.
-    This method is styled on unittest.TestCase.tearDown.
-    """
-    raise NotImplementedError()
-
-  def GetTestExpectationAndSkipValue(self, expectations):
-    """ Return test expectation and skip value instance in case expectation
-    is 'skip'. This is run after WillRunUserStory and before RunUserStory.
-    """
-    raise NotImplementedError()
-
-  def RunUserStory(self, results):
-    """ Override to do any action before running each one of all user stories
-    that share this same state.
-    This method is styled on unittest.TestCase.run.
-    """
-    raise NotImplementedError()
-
-  def TearDownState(self, results):
-    """ Override to do any action after running multiple user stories that
-    share this same state.
-    This method is styled on unittest.TestCase.tearDownClass.
-    """
-    raise NotImplementedError()