Deleting unused story sets

tools/perf/page_sets/tough_layer_cases.py

Index: tools/perf/page_sets/tough_layer_cases.py
diff --git a/tools/perf/page_sets/tough_layer_cases.py b/tools/perf/page_sets/tough_layer_cases.py
deleted file mode 100644
index ce12cb6b256ae7cbd244f1d8dab6c5bf310acd8a..0000000000000000000000000000000000000000
--- a/tools/perf/page_sets/tough_layer_cases.py
+++ /dev/null
@@ -1,22 +0,0 @@
-# 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 telemetry.page import page as page_module
-from telemetry import story
-
-
-class ToughLayerCasesPage(page_module.Page):
-
-  def __init__(self, url, page_set):
-    super(ToughLayerCasesPage, self).__init__(url=url, page_set=page_set)
-
-
-class ToughLayerCasesPageSet(story.StorySet):
-
-  """ A collection of tests to measure layer performance. """
-
-  def __init__(self):
-    super(ToughLayerCasesPageSet, self).__init__()
-
-    self.AddStory(ToughLayerCasesPage(
-      'file://layer_stress_tests/opacity.html', self))