Delete battor.power_cases and the power_cases page set

tools/perf/page_sets/power_cases.py

-# Copyright 2016 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 telemetry.page import page as page_module
-from telemetry.page import shared_page_state
-from telemetry import story
-
-
-URL_LIST = [
-    'https://webkit.org/blog-files/3d-transforms/poster-circle.html',
-    # Does not autoplay on Android devices.
-    'https://www.youtube.com/watch?v=3KANI2dpXLw?autoplay=1',
-    'about:blank'
-]
-
-
-class PowerCasesPage(page_module.Page):
-
-  def __init__(self, url, page_set, name=''):
-    super(PowerCasesPage, self).__init__(
-        url=url, page_set=page_set, name=name,
-        credentials_path = 'data/credentials.json',
-        shared_page_state_class=shared_page_state.SharedDesktopPageState)
-    self.archive_data_file = 'data/power_cases.json'
-
-  def RunPageInteractions(self, action_runner):
-    action_runner.Wait(10)
-
-
-class PowerCasesPageSet(story.StorySet):
-  """Power hungry pages, used for power testing."""
-
-  def __init__(self):
-    super(PowerCasesPageSet, self).__init__(
-        archive_data_file='data/power_cases.json',
-        cloud_storage_bucket=story.PARTNER_BUCKET)
-
-    for url in URL_LIST:
-      self.AddStory(PowerCasesPage(url, self))